Electrochemistry

205 questions · Chemistry · JEE Main

Electrochemistry

205 questions · Chemistry · JEE Main

Consider the following electrochemical cell at standard condition. $Au (s) ∣ QH_{2}, Q ∣ NH_{4} X (0.01 M) ∣∣ Ag^{+} (1 M) ∣ Ag (s) E_{cell} = + 0.4 V$ … Includes diagram2025 · 2 Apr · Shift 1 · Q23 · Numerical
$0.2% (w / v)$ solution of NaOH is measured to have resistivity $870.0 m Ω m$ . The molar conductivity of the solution will be $\times 1 0^{2} mS dm^{2} mol^{- 1}$ …2025 · 2 Apr · Shift 2 · Q24 · Numerical
Correct order of limiting molar conductivity for cations in water at 298 K is :2025 · 3 Apr · Shift 1 · Q18 · MCQ
The standard cell potential $(E_{cell}^{⊖})$ of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as 1.21 V . The standard half cell…2025 · 3 Apr · Shift 2 · Q16 · MCQ
On charging the lead storage battery, the oxidation state of lead changes from $x_{1}$ to $y_{1}$ at the anode and from $x_{2}$ to $y_{2}$ at the cathode. The values of $x_{1}, y_{1}, x_{2}, y_{2}$ are respectively :2025 · 4 Apr · Shift 1 · Q6 · MCQ
1 Faraday electricity was passed through $Cu^{2 +} (1.5 M, 1 L) / Cu$ and 0.1 Faraday was passed through $Ag^{+} (0.2 M, 1 L) / Ag$ electrolytic cells. After this the… Includes diagram2025 · 7 Apr · Shift 1 · Q23 · Numerical
Given below are two statements : 1 M aqueous solutions of each of $C u (N O_{3})_{2}$ , $A g N O_{3}$ , $H g_{2} (N O_{3})_{2}$ , $M g (N O_{3})_{2}$ are electrolysed using inert electrodes. Given: E0 $A g^{+}$ /Ag = 0.80 V, E0 $H g_{2}^{2 +}$ /Hg = 0.79 V, E0 $C u^{2 +}$ /Cu = 0.24 V…2025 · 7 Apr · Shift 2 · Q17 · MCQ
Consider the following half cell reaction $Cr_{2} O_{7}^{2 -} (aq) + 6 e^{-} + 14 H^{+} (aq) \to 2 Cr^{3 +} (aq) + 7 H_{2} O (ℓ)$ The reaction was conducted with…2025 · 8 Apr · Shift 2 · Q21 · Numerical
Which of the following electrolyte can be used to obtain $H_{2} S_{2} O_{8}$ by the process of electrolysis ?2025 · 22 Jan · Shift 1 · Q1 · MCQ
A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is . [Given : molar mass of aluminium and chlorine are $27 g mol^{- 1}$ …2025 · 22 Jan · Shift 1 · Q8 · MCQ
Given below are two statements : Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode. Statement (II) : The rate of corrosion is more in alkaline medium than in…2025 · 22 Jan · Shift 2 · Q2 · MCQ
$FeO_{4}^{2 -} + 2.0 V Fe^{3 +} 0.8 V Fe^{2 +} - 0.5 V Fe^{0}$ In the above diagram, the standard electrode potentials are given in volts…2025 · 23 Jan · Shift 1 · Q5 · MCQ
Standard electrode potentials for a few half cells are mentioned below : $E_{Cu^{2 +} / Cu}^{\circ} = 0.34 V, E_{Zn^{2 +} / Zn}^{\circ} = - 0.76 V E_{Ag^{+} / Ag}^{\circ} = 0.80 V, E_{Mg^{2 +} / Mg}^{\circ} = - 2.37 V$ …2025 · 23 Jan · Shift 2 · Q14 · MCQ
For the given cell $Fe^{2 +} (aq) + Ag_{(aq)}^{+} \to Fe^{3 +} (aq) + Ag_{(s)}$ The standard cell potential of the above reaction is Given: $Ag^{+} + e^{-} \to Ag Fe^{2 +} + 2 e^{-} \to Fe Fe^{3 +} + 3 e^{-} \to Fe E^{θ} = xV E^{θ} = yV E^{θ} = zV$ …2025 · 24 Jan · Shift 1 · Q18 · MCQ
Based on the data given below : $E_{Cr_{2} O_{7}^{2 -} / Cr^{3 +}}^{\circ} = 1.33 V E_{MnO_{4}^{-} / Mn^{2 +}}^{0} = 1.51 V E_{Cl_{2} / Cl^{(-)}}^{\circ} = 1.36 V E_{Cr^{3 +} / Cr}^{\circ} = - 0.74 V$ …2025 · 24 Jan · Shift 2 · Q7 · MCQ
Given below is the plot of the molar conductivity vs $concentration$ for KCl in aqueous solution. If, for the higher concentration of KCl solution, the resistance of the conductivity cell is $100Ω$ , then the… Includes diagram2025 · 28 Jan · Shift 1 · Q24 · Numerical
Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12 . The current in Amperes used for the given electrolysis is . (Nearest integer).2025 · 28 Jan · Shift 2 · Q23 · Numerical
The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.2025 · 29 Jan · Shift 1 · Q10 · MCQ
For a $M g$ | $M g^{2 +}$ (aq) || $A g^{+}$ (aq) | $A g$ the correct Nernst Equation is :2025 · 29 Jan · Shift 1 · Q2 · MCQ
The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?2025 · 29 Jan · Shift 1 · Q6 · MCQ
$O_{2}$ gas will be evolved as a product of electrolysis of : (A) an aqueous solution of $AgNO_{3}$ using silver electrodes. (B) an aqueous solution of $AgNO_{3}$ using platinum electrodes. (C) a dilute solution of $H_{2} SO_{4}$ …2025 · 29 Jan · Shift 2 · Q20 · MCQ
Match List - I with List - II : Choose the correct answer from the options given below : Includes table2025 · 29 Jan · Shift 2 · Q9 · MCQ
The potential for the given half cell at $298 K$ is (-) $\times 1 0^{- 2} V$ $2 H_{(aq)}^{+} + 2 e^{-} ⟶ H_{2} (g) [H^{+}] = 1 M, P_{H_{2}} = 2 atm$ …2024 · 1 Feb · Shift 1 · Q23 · Numerical
The amount of electricity in Coulomb required for the oxidation of $1 mol$ of $H_{2} O$ to $O_{2}$ is $\times 1 0^{5} C$ .2024 · 1 Feb · Shift 2 · Q26 · Numerical
Consider the following redox reaction : $MnO_{4}^{-} + H^{+} + H_{2} C_{2} O_{4} ⇌ Mn^{2 +} + H_{2} O + CO_{2}$ The standard reduction potentials are given as…2024 · 1 Feb · Shift 2 · Q28 · Numerical
One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?2024 · 4 Apr · Shift 1 · Q15 · MCQ
What pressure (bar) of $H_{2}$ would be required to make emf of hydrogen electrode zero in pure water at $2 5^{\circ} C$ ?2024 · 4 Apr · Shift 1 · Q19 · MCQ
Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of $40%$ to produce electricity C. uses aluminum as catalysts D. is eco-friendly E. is actually a type of Galvanic cell only Choose the…2024 · 4 Apr · Shift 2 · Q1 · MCQ
For a strong electrolyte, a plot of molar conductivity against (concentration) $^{1/2}$ is a straight line, with a negative slope, the correct unit for the slope is2024 · 4 Apr · Shift 2 · Q9 · MCQ
Molar ionic conductivities of divalent cation and anion are $57 S cm^{2} mol^{- 1}$ and $73 S cm^{2} mol^{- 1}$ respectively. The molar conductivity of solution of an electrolyte with the above cation and…2024 · 5 Apr · Shift 1 · Q15 · MCQ
The reaction at cathode in the cells commonly used in clocks involves.2024 · 5 Apr · Shift 1 · Q18 · MCQ
The quantity of silver deposited when one coulomb charge is passed through $AgNO_{3}$ solution :2024 · 5 Apr · Shift 2 · Q17 · MCQ
For the electro chemical cell $M M^{2 +} ∣ X ∣ X^{2 -}$ If $E_{(M^{2 +} / M)}^{0} = 0.46 V$ and $E_{(x / x^{2 -})}^{0} = 0.34 V$ …2024 · 5 Apr · Shift 2 · Q19 · MCQ
A conductivity cell with two electrodes (dark side) are half filled with infinitely dilute aqueous solution of a weak electrolyte. If volume is doubled by adding more water at constant temperature, the molar conductivity of the cell will - Includes diagram2024 · 6 Apr · Shift 1 · Q2 · MCQ
How can an electrochemical cell be converted into an electrolytic cell ?2024 · 6 Apr · Shift 2 · Q9 · MCQ
Given below are two statements : Statement (I) : Fusion of $MnO_{2}$ with $KOH$ and an oxidising agent gives dark green $K_{2} MnO_{4}$ . Statement (II) : Manganate ion on electrolytic oxidation in alkaline…2024 · 8 Apr · Shift 2 · Q14 · MCQ
The emf of cell $Tl (0.001 M) Tl^{+} (0.01 M) Cu^{2 +} ∣ Cu$ is $0.83 V$ at $298 K$ . It could be increased by :2024 · 8 Apr · Shift 2 · Q8 · MCQ
The reaction; $\frac{1}{2} H_{2 (g)} + AgCl_{(s)} \to H_{(aq)}^{+} + Cl_{(aq)}^{-} + Ag_{(s)}$ occurs in which of the following galvanic cell :2024 · 8 Apr · Shift 2 · Q9 · MCQ
The molar conductivity for electrolytes $A$ and $B$ are plotted against $C^{3/2}$ as shown below. Electrolytes $A$ and $B$ respectively are: Includes diagram2024 · 9 Apr · Shift 1 · Q2 · MCQ
The standard reduction potentials at $298 K$ for the following half cells are given below : $Cr_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 Cr^{3 +} + 7 H_{2} O, E^{\circ} = 1.33 V Fe^{3 +} (aq) + 3 e^{-} \to Fe Ni^{2 +} (aq) + 2 e^{-} \to Ni Ag^{+} (aq) + e^{-} \to Ag Au^{3 +} (aq) + 3 e^{-} \to Au E^{\circ} = - 0.04 V E^{\circ} = - 0.25 V E^{\circ} = 0.80 V E^{\circ} = 1.40 V$ …2024 · 9 Apr · Shift 1 · Q21 · Numerical
Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning :2024 · 9 Apr · Shift 2 · Q12 · MCQ
Match List I with List II Choose the correct answer from the options given below : Includes table2024 · 9 Apr · Shift 2 · Q9 · MCQ
The mass of silver (Molar mass of $Ag : 108 gmol^{- 1}$ ) displaced by a quantity of electricity which displaces $5600 mL$ of $O_{2}$ at S.T.P. will be g.2024 · 27 Jan · Shift 1 · Q21 · Numerical
Which of the following statements is not correct about rusting of iron?2024 · 27 Jan · Shift 2 · Q12 · MCQ
The hydrogen electrode is dipped in a solution of $pH = 3$ at $2 5^{\circ} C$ . The potential of the electrode will be $\times 1 0^{- 2} V$ . $(\frac{2.303 RT}{F} = 0.059 V)$ …2024 · 27 Jan · Shift 2 · Q25 · Numerical
The mass of zinc produced by the electrolysis of zine sulphate solution with a steady current of $0.015 A$ for 15 minutes is $\times 1 0^{- 4} g$ . (Atomic mass of zinc $= 65.4 amu$ )2024 · 29 Jan · Shift 1 · Q21 · Numerical
A constant current was passed through a solution of $AuCl_{4}^{-}$ ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was $1.314 g$ . The total charge passed through the solution is…2024 · 29 Jan · Shift 2 · Q25 · Numerical
Alkaline oxidative fusion of $MnO_{2}$ gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are2024 · 30 Jan · Shift 2 · Q13 · MCQ
Reduction potential of ions are given below: $ClO_{4}^{-} E^{\circ} = 1.19 V IO_{4}^{-} E^{\circ} = 1.65 V BrO_{4}^{-} E^{\circ} = 1.74 V$ …2024 · 30 Jan · Shift 2 · Q19 · MCQ
Identify the factor from the following that does not affect electrolytic conductance of a solution.2024 · 31 Jan · Shift 1 · Q10 · MCQ
Number of alkanes obtained on electrolysis of a mixture of $CH_{3} COONa$ and $C_{2} H_{5} COONa$ is .2024 · 31 Jan · Shift 1 · Q24 · Numerical
One Faraday of electricity liberates $x \times 1 0^{- 1}$ gram atom of copper from copper sulphate. $x$ is .2024 · 31 Jan · Shift 1 · Q26 · Numerical
The values of conductivity of some materials at $298.15 K^{- 1} in Sm^{- 1}$ are $2.1 \times 1 0^{3}$ , $1.0 \times 1 0^{- 16}, 1.2 \times 10, 3.91, 1.5 \times 1 0^{- 2}, 1 \times 1 0^{- 7}, 1.0 \times 1 0^{3}$ . The number of…2024 · 31 Jan · Shift 2 · Q25 · Numerical
At what pH, given half cell $Mn O_{4}^{-} (0.1 M) ∣ M n^{2 +} (0.001 M)$ will have electrode potential of 1.282 V? (Nearest Integer) Given $E_{Mn O_{4}^{-} ∣M n^{2 +}}^{o} = 1.54 V, \frac{2.303 RT}{F} = 0.059 V$ …2023 · 1 Feb · Shift 1 · Q14 · Numerical
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : An aqueous solution of $KOH$ when used for volumetric analysis, its concentration should be checked before…2023 · 1 Feb · Shift 2 · Q12 · MCQ
$1 \times 1 0^{- 5} M AgNO_{3}$ is added to $1 L$ of saturated solution of $AgBr$ . The conductivity of this solution at $298 K$ is $\times 1 0^{- 8} S m^{- 1}$ …2023 · 1 Feb · Shift 2 · Q17 · Numerical
The standard electrode potential of $M^{+} / M$ in aqueous solution does not depend on2023 · 6 Apr · Shift 1 · Q2 · MCQ
The standard reduction potentials at $298 K$ for the following half cells are given below: $NO_{3}^{-} + 4 H^{+} + 3 e^{-} \to NO (g) + 2 H_{2} O E^{θ} = 0.97 V V^{2 +} (aq) + 2 e^{-} \to V E^{θ} = - 1.19 V Fe^{3 +} (aq) + 3 e^{-} \to Fe E^{θ} = - 0.04 V Ag^{+} (aq) + e^{-} \to Ag (s) E^{θ} = 0.80 V Au^{3 +} (aq) + 3 e^{-} \to Au (s) E^{θ} = 1.40 V$ …2023 · 6 Apr · Shift 2 · Q17 · Numerical
The reaction $\frac{1}{2} H_{2} (g) + AgCl (s) ⇌ H^{+} (aq) + Cl^{-} (aq) + Ag (s)$ occurs in which of the given galvanic cell.2023 · 8 Apr · Shift 1 · Q10 · MCQ
The number of incorrect statements from the following is . A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy. B. $E_{cell}^{\circ}$ …2023 · 8 Apr · Shift 2 · Q21 · Numerical
$Fe O_{4}^{2 -} + 2.2V F e^{3 +} + 0.70V F e^{2 +} - 0.45V F e^{0}$ $E_{F e O_{4}^{2 -} / F e^{2 +}}^{θ}$ is $x \times 1 0^{- 3}$ V. The value of $x$ is 2023 · 10 Apr · Shift 1 · Q22 · Numerical
The specific conductance of $0.0025 M$ acetic acid is $5 \times 1 0^{- 5} S cm^{- 1}$ at a certain temperature. The dissociation constant of acetic acid is $\times 1 0^{- 7}$ (Nearest…2023 · 10 Apr · Shift 2 · Q20 · Numerical
In an electrochemical reaction of lead, at standard temperature, if $E^{0} (Pb^{2 +} / Pb) = m$ Volt and $E^{0} (Pb^{4 +} / Pb) = n$ Volt, then the…2023 · 11 Apr · Shift 1 · Q24 · Numerical
The number of correct statements from the following is A. $E_{cell}$ is an intensive parameter B. A negative $E^{⊖}$ means that the redox couple is a stronger reducing agent than…2023 · 11 Apr · Shift 2 · Q21 · Numerical
For lead storage battery pick the correct statements A. During charging of battery, $PbSO_{4}$ on anode is converted into $PbO_{2}$ B. During charging of battery, $PbSO_{4}$ on cathode is converted into $PbO_{2}$ …2023 · 12 Apr · Shift 1 · Q10 · MCQ
A metal surface of $100 cm^{2}$ area has to be coated with nickel layer of thickness $0.001 mm$ . A current of $2 A$ was passed through a solution of $Ni (NO_{3})_{2}$ for ' $x$ …2023 · 13 Apr · Shift 1 · Q20 · Numerical
At $298 K$ , the standard reduction potential for $Cu^{2 +} / Cu$ electrode is $0.34 V$ . Given : $K_{sp} Cu (OH)_{2} = 1 \times 1 0^{- 20}$ Take $\frac{2.303 RT}{F} = 0.059 V$ …2023 · 13 Apr · Shift 2 · Q19 · Numerical
The number of correct statements from the following is . (A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes. (B) The number of ions per unit volume that carry…2023 · 15 Apr · Shift 1 · Q17 · Numerical
At 298 K, a 1 litre solution containing 10 mmol of $C r_{2} O_{7}^{2 -}$ and 100 mmol of $C r^{3 +}$ shows a pH of 3.0. Given : $C r_{2} O_{7}^{2 -} \to C r^{3 +}; E^{\circ} = 1.330$ V and $\frac{2.303 RT}{F} = 0.059$ …2023 · 24 Jan · Shift 1 · Q21 · Numerical
Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.2023 · 24 Jan · Shift 2 · Q5 · MCQ
Consider the cell $Pt (s) ∣ H_{2} (g) (1 atm) ∣ H^{+} (aq, [H^{+}] = 1) ∣∣F e^{3 +} (aq), F e^{2 +} (aq) ∣Pt (s)$ Given $E_{F e^{3 +} /F e^{2 +}}^{o} = 0.771 V$ and $E_{H^{+} /1/2 H_{2}}^{o} = 0 V, T = 298 K$ …2023 · 25 Jan · Shift 1 · Q16 · Numerical
$P t (s) ∣ H_{2} (g) (1 ba r) ∣ H^{+} (a q) (1 M) ∣∣ M^{3 +} (a q), M^{+} (a q) ∣ P t (s)$ The $E_{cell}$ for the given cell is 0.1115 V at 298 K when $\frac{[ M ^{+} ( a q ) ]}{[ M ^{3 +} ( a q ) ]} = 1 0^{a}$ The…2023 · 25 Jan · Shift 2 · Q17 · Numerical
The standard electrode potential $(M^{3 +} / M^{2 +})$ for V, Cr, Mn & Co are $-$ 0.26 V, $-$ 0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate $H_{2}$ from a dilute acid are :2023 · 29 Jan · Shift 1 · Q11 · MCQ
Following figure shows dependence of molar conductance of two electrolytes on concentration. $Λ m o$ is the limiting molar conductivity. The number of $\underline{incorrect}$ statement(s) from the following… Includes diagram2023 · 29 Jan · Shift 1 · Q16 · Numerical
The equilibrium constant for the reaction $Zn (s) + S n^{2 +} (aq)$ $⇌$ $Z n^{2 +} (aq) + Sn (s)$ is $1 \times 1 0^{20}$ at 298 K. The magnitude of standard electrode potential of $Sn/S n^{2 +}$ if $E_{Z n^{2 +} /Zn}^{Θ} = - 0.76 V$ …2023 · 29 Jan · Shift 2 · Q17 · Numerical
Consider the cell $Pt_{(s)} ∣ H_{2} (g, 1 atm) ∣ H^{+} (aq, 1 M) ∣∣ Fe^{3 +} (aq), Fe^{2 +} (aq) ∣ Pt (s)$ …2023 · 30 Jan · Shift 1 · Q18 · Numerical
The electrode potential of the following half cell at $298 K X X^{2 +} (0.001 M) ∥ Y^{2 +} (0.01 M) Y$ is $\times 10^{-2}…2023 · 30 Jan · Shift 2 · Q20 · Numerical
Which one of the following statements is correct for electrolysis of brine solution?2023 · 31 Jan · Shift 1 · Q12 · MCQ
The logarithm of equilibrium constant for the reaction $Pd^{2 +} + 4 Cl^{-} ⇌ PdCl_{4}^{2 -}$ is (Nearest integer) Given : $\frac{2.303 R T}{F} = 0.06 V Pd_{(aq)}^{2 +} + 2 e^{-} ⇌ Pd (s) E^{⊖} = 0.83 V PdCl_{4}^{2 -} (aq) + 2 e^{-} ⇌ Pd (s) + 4 Cl^{-} (aq) E^{⊖} = 0.65 V$ …2023 · 31 Jan · Shift 1 · Q17 · Numerical
The resistivity of a $0.8 M$ solution of an electrolyte is $5 \times 1 0^{- 3} Ω cm$ . Its molar conductivity is $\times 1 0^{4} Ω^{- 1} cm^{2} mol^{- 1}$ . (Nearest…2023 · 31 Jan · Shift 2 · Q19 · Numerical
The cell potential for the following cell Pt | $H_{2}$ (g)| $H^{+}$ (aq)|| $C u^{2 +}$ (0.01 M)| $C u$ (s) is 0.576 V at 298 K. The pH of the solution is . (Nearest integer) (Given : $E_{C u^{2 +} / C u}^{o} = 0.34$ V and $\frac{2.303 R T}{F} = 0.06$ …2022 · 24 Jun · Shift 1 · Q15 · Numerical
The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750 $Ω$ . If the conductivity of 0.01 M KCl solution at 298 K is 0.152 $\times$ 10 $-$ 3 S cm $-$ 1, then the cell constant of the conductivity cell is $\times$ …2022 · 24 Jun · Shift 2 · Q17 · Numerical
The cell potential for $Zn Zn^{2 +} (aq) Sn^{x +} Sn$ is $0.801 V$ at $298 K$ . The reaction quotient for the above reaction is $1 0^{- 2}$ . The number of…2022 · 25 Jul · Shift 1 · Q14 · Numerical
The spin-only magnetic moment value of $M^{3 +}$ ion (in gaseous state) from the pairs $C r^{3 +}$ / $C r^{2 +}$ , $M n^{3 +}$ / $M n^{2 +}$ , $F e^{3 +}$ / $F e^{2 +}$ and $C o^{3 +}$ / $C o^{2 +}$ that has negative standard electrode potential, is …2022 · 25 Jul · Shift 2 · Q19 · Numerical
The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is $Λ_{m 1}$ and that of 20 moles another identical cell heaving 80 mL NaCl solution is $Λ_{m 2}$ . The conductivities exhibited by…2022 · 25 Jul · Shift 2 · Q4 · MCQ
In a cell, the following reactions take place $F e^{2 +} \to F e^{3 +} + e^{-} 2 I^{-} \to I_{2} + 2 e^{-} E_{F e^{3 +} / F e^{2 +}}^{o} = 0.77 V E_{I_{2} / I^{-}}^{o} = 0.54 V$ …2022 · 25 Jun · Shift 1 · Q20 · Numerical
A solution of $F e_{2} (S O_{4})_{3}$ is electrolyzed for 'x' min with a current of 1.5 A to deposit 0.3482 g of $F e$ . The value of x is . [nearest integer] Given : 1 F = 96500 C mol $-$ 1 Atomic mass of $F e$ = 56 g mol…2022 · 25 Jun · Shift 2 · Q19 · Numerical
The correct order of reduction potentials of the following pairs is A. $C l_{2}$ / $C l^{-}$ B. $I_{2}$ / $I^{-}$ C. $A g^{+}$ /Ag D. $N a^{+}$ /Na E. $L i^{+}$ /Li Choose the correct answer from the options given below.2022 · 25 Jun · Shift 2 · Q7 · MCQ
The amount of charge in $F$ (Faraday) required to obtain one mole of iron from $Fe_{3} O_{4}$ is . (Nearest Integer)2022 · 26 Jul · Shift 1 · Q21 · Numerical
The $(\frac{\partial E}{\partial T})_{P}$ of different types of half cells are as follows: (Where E is the electromotive force) Which of the above half cells would be preferred to be used as reference electrode? Includes table2022 · 26 Jun · Shift 1 · Q4 · MCQ
$C u$ (s) + $S n^{2 +}$ (0.001M) $\to$ $C u^{2 +}$ (0.01M) + $S n$ (s) The Gibbs free energy change for the above reaction at 298 K is x $\times$ 10 $-$ 1 kJ mol $-$ 1. The value of x is . [nearest integer] [Given : $E_{C u^{2 +} / C u}^{Θ} = 0.34 V$ …2022 · 26 Jun · Shift 2 · Q21 · Numerical
Given below are two statements : Statement I : For KI, molar conductivity increases steeply with dilution Statement II : For carbonic acid, molar conductivity increases slowly with dilution In the light of the above statements, choose the…2022 · 27 Jul · Shift 2 · Q4 · MCQ
The limiting molar conductivities of $N a I$ , $N a N O_{3}$ and $A g N O_{3}$ are 12.7, 12.0 and 13.3 mS m2 mol $-$ 1, respectively (all at 25 $^{\circ}$ C). The limiting molar conductivity of $A g I$ at this temperature is mS…2022 · 27 Jun · Shift 1 · Q14 · Numerical
For the reaction taking place in the cell : Pt (s)| $H_{2}$ (g)| $H^{+}$ (aq) || $A g^{+}$ (aq) |Ag (s) E $_{ce l l}^{o}$ = + 0.5332 V. The value of $Δ$ fG $^{\circ}$ is kJ mol $-$ 1. (in nearest integer)2022 · 27 Jun · Shift 2 · Q20 · Numerical
In 3d series, the metal having the highest $M^{2 +}$ /M standard electrode potential is :2022 · 27 Jun · Shift 2 · Q5 · MCQ
Match List - I with List - II. Choose the correct answer from the options given below: Includes table2022 · 28 Jul · Shift 1 · Q3 · MCQ
The quantity of electricity in Faraday needed to reduce 1 mol of Cr2O $_{7}^{2 -}$ to $C r^{3 +}$ is .2022 · 28 Jun · Shift 1 · Q20 · Numerical
For the given reactions $S n^{2 +}$ + 2e $- \to$ Sn $S n^{4 +}$ + 4e $- \to$ Sn the electrode potentials are ; $E_{S n^{2 +} / S n}^{o} = - 0.140$ V and $E_{S n^{4 +} / S n}^{o} = + 0.010$ V. The magnitude of standard electrode potential for $S n^{4 +} / S n^{2 +}$ …2022 · 28 Jun · Shift 2 · Q15 · Numerical
Resistance of a conductivity cell (cell constant $129 m^{- 1}$ ) filled with $74.5 ppm$ solution of $KCl$ is $100 Ω$ (labelled as solution 1). When the same cell is filled with $KCl$ solution of $149 ppm$ …2022 · 29 Jul · Shift 1 · Q16 · Numerical
For a cell, $Cu (s) Cu^{2 +} (0.001 M) ∥ Ag^{+} (0.01 M) Ag (s)$ the cell potential is found to be $0.43 V$ at $298 K$ . The magnitude…2022 · 29 Jul · Shift 2 · Q18 · Numerical
A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced a STP is cm3. (Nearest integer) [Given : Faraday…2022 · 29 Jun · Shift 1 · Q13 · Numerical
The cell potential for the given cell at 298 K Pt| $H_{2}$ (g, 1 bar) | $H^{+}$ (aq) || $C u^{2 +}$ (aq) | Cu(s) is 0.31 V. The pH of the acidic solution is found to be 3, whereas the concentration of $C u^{2 +}$ is 10 $-$ x M. The value of x is …2022 · 29 Jun · Shift 2 · Q17 · Numerical
In which of the following half cells, electrochemical reaction is pH dependent?2022 · 30 Jun · Shift 1 · Q4 · MCQ
If the conductivity of mercury at 0 $^{\circ}$ C is 1.07 $\times$ 106 S m $-$ 1 and the resistance of a cell containing mercury is 0.243 $Ω$ , then the cell constant of the cell is x $\times$ 104 m $-$ 1. The value of x is …2021 · 1 Sep · Shift 2 · Q22 · Numerical
A 5.0 m mol dm $-$ 3 aqueous solution of $K C l$ has a conductance of 0.55 mS when measured in a cell of cell constant 1.3 cm $-$ 1. The molar conductivity of this solution is mSm2 mol $-$ 1. (Round off to the…2021 · 16 Mar · Shift 2 · Q16 · Numerical
A KCl solution of conductivity 0.14 S m $-$ 1 shows a resistance of 4.19 $Ω$ in a conductivity cell. If the same cell is filled with an HCl solution, the resistance drops to 1.03 $Ω$ . The conductivity of the HCl solution is $\times$ …2021 · 17 Mar · Shift 2 · Q13 · Numerical
For the reaction 2 $F e^{3 +}$ (aq) + 2 $I$ $-$ (aq) $\to$ 2 $F e^{2 +}$ (aq) + $I_{2}$ (s) the magnitude of the standard molar Gibbs free energy change, $Δ$ rG $_{m}^{o}$ = $-$ kJ (Round off to the Nearest Integer). $[E_{F e^{2 +} / F e (s)}^{o} = - 0.440 V; E_{I_{2} /2 I^{-}}^{o} = 0.539 V; E_{F e^{3 +} / F e (s)}^{o} = - 0.036 V F = 96500 C]$ …2021 · 18 Mar · Shift 1 · Q23 · Numerical
The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol $-$ 1 respectively. The molar conductivity at infinite dilution of barium sulphate is …2021 · 18 Mar · Shift 2 · Q18 · Numerical
Potassium chlorate is prepared by electrolysis of $K C l$ in basic solution as shown by following equation. 6 $O H^{-}$ + $C l^{-} \to$ $C l O_{3}^{-}$ + 3 $H_{2} O$ + 6 $e^{-}$ A current of xA has to be passed for 10h to produce 10.0g of potassium chlorate. The…2021 · 20 Jul · Shift 2 · Q24 · Numerical
Assume a cell with the following reaction $C u_{(s)} + 2 A g^{+} (1 \times 1 0^{- 3} M) \to C u^{2 +} (0.250 M) + 2 A g_{(s)}$ $E_{ce l l}^{Θ} = 2.97$ V Ecell for the above reaction is V. (Nearest integer)…2021 · 22 Jul · Shift 2 · Q18 · Numerical
The electrode potential of $M^{2 +}$ /M of 3d-series elements shows positive value for :2021 · 24 Feb · Shift 1 · Q1 · MCQ
The magnitude of the change in oxidising power of the $M n O_{4}^{-} / M n^{2 +}$ couple is x $\times$ 10 $-$ 4 V, if the $H^{+}$ concentration is decreased from 1M to 10 $-$ 4 M at 25 $^{\circ}$ C. (Assume concentration of $M n O_{4}^{-}$ and $M n^{2 +}$ …2021 · 24 Feb · Shift 2 · Q21 · Numerical
Copper reduces NO $_{3}^{-}$ into $N O$ and $N O_{2}$ depending upon the concentration of $H N O_{3}$ in solution. (Assuming fixed [Cu2+] and PNO = PNO2), the $H N O_{3}$ concentration at which the thermodynamic tendency for reduction of NO $_{3}^{-}$ into $N O$ …2021 · 25 Feb · Shift 2 · Q15 · Numerical
Consider the cell at 25 $^{\circ}$ C Zn | $Z n^{2 +}$ (aq), (1M) || $F e^{3 +}$ (aq), $F e^{2 +}$ (aq) | Pt(s) The fraction of total iron present as $F e^{3 +}$ ion at the cell potential of 1.500 V is x $\times$ 10 $-$ 2. The value of x is …2021 · 25 Jul · Shift 1 · Q20 · Numerical
These are physical properties of an element (A) Sublimation enthalpy (B) Ionisation enthalpy (C) Hydration enthalpy (D) Electron gain enthalpy The total number of above properties that affect the reduction potential is …2021 · 26 Aug · Shift 1 · Q14 · Numerical
Given below are two statements : Statement I : The limiting molar conductivity of $K C l$ (strong electrolyte) is higher compared to that of $C H_{3} C O O H$ (weak electrolyte). Statement II : Molar conductivity decreases with decrease in…2021 · 26 Aug · Shift 1 · Q6 · MCQ
For the galvanic cell, Zn(s) + $C u^{2 +}$ (0.02 M) $\to$ $Z n^{2 +}$ (0.04 M) + Cu(s), Ecell = $\times$ 10 $-$ 2 V. (Nearest integer) [Use : $E_{C u / C u^{2 +}}^{0}$ = $-$ 0.34 V, $E_{Z n / Z n^{2 +}}^{0}$ = + 0.76 V, $\frac{2.303 R T}{F} = 0.059 V$ …2021 · 26 Aug · Shift 2 · Q17 · Numerical
Consider the following reaction $M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{+ 2} + 4 H_{2} O, E^{o} = 1.51 V$ . The quantity of electricity required in Faraday to reduce five moles of $M n O_{4}^{-}$ is . (Integer answer)2021 · 26 Feb · Shift 1 · Q20 · Numerical
Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :2021 · 26 Feb · Shift 1 · Q9 · MCQ
Emf of the following cell at 298K in V is x $\times$ 10 $-$ 2. $Z n$ | $Z n^{2 +}$ (0.1 M)|| $A g^{+}$ (0.01 M)| $A g$ The value of x is . (Rounded off to the nearest integer) [Given : $E_{Z n^{2 +} / Z n}^{θ} = - 0.76 V; E_{A g^{2 +} / A g}^{θ} = + 0.80 V; \frac{2.303 R T}{F} = 0.059$ …2021 · 26 Feb · Shift 2 · Q21 · Numerical
The resistance of a conductivity cell with cell constant 1.14 cm $-$ 1, containing 0.001 M KCl at 298 K is 1500 $Ω$ . The molar conductivity of 0.001 M KCl solution at 298 K in S cm2 mol $-$ 1 is . (Integer…2021 · 27 Aug · Shift 2 · Q18 · Numerical
The conductivity of a weak acid HA of concentration 0.001 mol L $-$ 1 is 2.0 $\times$ 10 $-$ 5 S cm $-$ 1. If $Λ_{m}^{o}$ (HA) = 190 S cm2 mol $-$ 1, the ionization constant (Ka) of HA is equal to $\times$ 10 $-$ …2021 · 27 Jul · Shift 1 · Q15 · Numerical
For the cell Cu(s) | $C u^{2 +}$ (aq) (0.1 M) || $A g^{+}$ (aq) (0.01 M) | Ag(s) the cell potential E1 = 0.3095 V For the cell Cu(s) | $C u^{2 +}$ (aq) (0.01 M) || $A g^{+}$ (aq) (0.001 M) | Ag(s) the cell potential = $\times$ …2021 · 27 Jul · Shift 2 · Q22 · Numerical
Consider the following cell reaction : $C d_{(s)} + H g_{2} S O_{4 (s)} + \frac{9}{5} H_{2} O_{(l)} ⇌$ $C d S O_{4} . \frac{9}{5} H_{2} O_{(s)} + 2 H g_{(l)}$ The value of $E_{ce l l}^{0}$ is 4.315 V at 25 $^{\circ}$ C. If $Δ$ H…2021 · 31 Aug · Shift 1 · Q14 · Numerical
Match List - I with List - II Choose the most appropriate answer from the options given below : Includes table2021 · 31 Aug · Shift 2 · Q5 · MCQ
The Gibbs change (in J) for the given reaction at [ $C u^{2 +}$ ] = [ $S n^{2 +}$ ] = 1 M and 298K is : $C u$ (s) + $S n^{2 +}$ (aq.) $\to$ $C u^{2 +}$ (aq.) + $S n$ (s); ( $E_{S n^{2 +} ∣ S n}^{0} = - 0.16 V$ , $E_{C u^{2 +} ∣ C u}^{0} = 0.34 V$ ) Take F = 96500…2020 · 2 Sep · Shift 1 · Q4 · Numerical
For the disproportionation reaction 2 $C u^{+}$ (aq) ⇌ $C u$ (s) + $C u^{2 +}$ (aq) at 298 K. ln K (where K is the equilibrium constant) is × 10–1. Given : ( $E_{C u^{2 +} / C u^{+}}^{0} = 0.16 V E_{C u^{+} / C u}^{0} = 0.52 V \frac{R T}{F} = 0.025$ …2020 · 2 Sep · Shift 2 · Q1 · Numerical
Let C $N a C l$ and C $B a S O_{4}$ be the conductances (in S) measured for saturated aqueous solutions of $N a C l$ and $B a S O_{4}$ , respectively, at a temperature T. Which of the following is false?2020 · 3 Sep · Shift 1 · Q11 · MCQ
The photoelectric current from $N a$ (Work function, w0 = 2.3 eV) is stopped by the output voltage of the cell Pt(s) | $H_{2}$ (g, 1 Bar) | $H C l$ (aq., pH =1) | AgCl(s) | Ag(s). The pH of aq. $H C l$ required to stop the photoelectric current…2020 · 3 Sep · Shift 1 · Q7 · Numerical
An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per the following equation $C r_{2} O_{7}^{2 -}$ + $14 H^{+}$ + 6e– $\to$ $2 C r^{3 +}$ + $7 H_{2} O$ The amount of $C r^{3 +}$ obtained was 0.104 g. The efficiency of the…2020 · 3 Sep · Shift 2 · Q21 · Numerical
$E_{C u^{2 +} ∣ C u}^{0}$ = +0.34 V $E_{Z n^{2 +} ∣ Z n}^{0}$ = -0.76 V Identify the incorrect statement from the option below for the above cell : Includes diagram2020 · 4 Sep · Shift 1 · Q11 · MCQ
250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M $A g N O_{3}$ and 0.1 M $A u C l$ . The solution was electrolyzed at 2V by passing a current of 1A for 15 minutes. The metal/metals electrodeposited will be [ $E_{A g^{+} / A g}^{0}$ …2020 · 4 Sep · Shift 2 · Q17 · MCQ
An oxidation-reduction reaction in which 3 electrons are transferred has a $Δ$ Gº of 17.37 kJ mol–1 at 25 oC. The value of Eo cell (in V) is × 10–2. (1 F = 96,500 C mol–1)2020 · 5 Sep · Shift 1 · Q15 · Numerical
The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given figure. The electrolyte X is : Includes diagram2020 · 5 Sep · Shift 2 · Q13 · MCQ
Potassium chlorate is prepared by the electrolysis of $K C l$ in basic solution $6 O H^{-} + C l^{-}$ $\to$ $C l O_{3}^{-} + 3 H_{2} O + 6 e^{-}$ If only 60% of the current is utilized in the reaction, the time (rounded to the nearest hour) required to produce…2020 · 6 Sep · Shift 1 · Q3 · Numerical
For the given cell : $C u$ (s) | $C u^{2 +}$ (C1M) || $C u^{2 +}$ (C2M) | $C u$ (s) change in Gibbs energy ( $Δ$ G) is negative, if :2020 · 6 Sep · Shift 2 · Q16 · MCQ
Given that the standard potentials (Eo) of $C u^{2 +}$ / $C u$ and $C u^{+}$ / $C u$ are 0.34 V and 0.522 V respectively, the Eo of $C u^{2 +}$ / $C u^{+}$ :2020 · 7 Jan · Shift 1 · Q7 · MCQ
The equation that is incorrect is :2020 · 7 Jan · Shift 2 · Q13 · MCQ
What would be the electrode potential for the given half cell reaction at pH = 5? . 2 $H_{2} O$ $\to$ $O_{2}$ + 4 $H$ $\oplus$ + 4e– ; $E_{r e d}^{0}$ = 1.23 V (R = 8.314 J mol–1 K–1 ; Temp = 298 k; oxygen under std. atm.…2020 · 8 Jan · Shift 1 · Q9 · Numerical
For an electrochemical cell $S n$ (s) | $S n^{2 +}$ (aq,1M)|| $P b^{2 +}$ (aq,1M)| $P b$ (s) the ratio $\frac{[ S n ^{2 +} ]}{[ P b ^{2 +} ]}$ when this cell attains equilibrium is . (Given…2020 · 8 Jan · Shift 2 · Q10 · Numerical
108 g of silver (molar mass 108 g mol–1) is deposited at cathode from $A g N O_{3}$ (aq) solution by a certain quantity of electricity. The volume (in L) of oxygen gas produced at 273 K and 1 bar pressure from water by the same quantity of…2020 · 9 Jan · Shift 1 · Q12 · Numerical
Given that $E^{Θ}_{O_{2} / H_{2} O} = 1.23 V$ ; $E^{Θ}_{S_{2} O_{8}^{2 -} / S O_{4}^{2 -}} = 2.05 V$ $E^{Θ}_{B r_{2} / B r^{-}} = 1.09 V E^{Θ}_{A u^{3 +} / A u} = 1.4 V$ The strongest oxidizing agent is :2019 · 8 Apr · Shift 1 · Q5 · MCQ
Calculate the standard cell potential in (V) of the cell in which following reaction takes place : $F e^{2 +}$ (aq) + $A g^{+}$ (aq) $\to$ $F e^{3 +}$ (aq) + $A g$ (s) Given that $E_{A g^{+} / A g}^{o} = x V E_{F e^{2 +} / F e}^{o} = y V E_{F e^{3 +} / F e}^{o} = z V$ 2019 · 8 Apr · Shift 2 · Q24 · MCQ
The standard Gibbs energy for the given cell reaction in kJ mol–1 at 298 K is : $Z n$ (s) + $C u^{2 +}$ (aq) $\to$ $Z n^{2 +}$ (aq) + $C u$ (s), E° = 2 V at 298 K (Faraday's constant, F = 96000 C mol–1)2019 · 9 Apr · Shift 1 · Q5 · MCQ
A solution of $N i (N O_{3})_{2}$ is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many mole of $N i$ will be deposited at the cathode?2019 · 9 Apr · Shift 2 · Q8 · MCQ
The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of $P b S O_{4}$ electrolyzed in g during the process is : (Molar mass of $P b S O_{4}$ = 303 g mol $-$ 1)2019 · 9 Jan · Shift 1 · Q9 · MCQ
If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction $Z n$ (s) + $C u^{2 +}$ (aq) $⇌$ $Z n^{2 +}$ (aq) + $C u$ (s) at 300 K is approximately, (R = 8 JK $-$ 1mol $-$ 1, F =…2019 · 9 Jan · Shift 2 · Q11 · MCQ
Consider the statements S1 and S2 S1 : Conductivity always increases with decrease in the concentration of electrolyte. S2 : Molar conductivity always increases with decrease in the concentration of electrolyte. The correct option among…2019 · 10 Apr · Shift 1 · Q19 · MCQ
Which one of the following graphs between molar conductivity ( $Λ_{m}$ ) versus $C$ is correct ?2019 · 10 Apr · Shift 2 · Q3 · MCQ
Consider the following reduction processes : $Z n^{2 +}$ + 2e– $\to$ Zn(s) ; Eo = – 0.76 V $C a^{2 +}$ + 2e– $\to$ Ca(s); Eo = –2.87 V $M g^{2 +}$ + 2e– $\to$ Mg(s) ; Eo = – 2.36 V $N i_{2}$ + 2e– $\to$ Ni(s) ; Eo = – 0.25 The reducing power of the…2019 · 10 Jan · Shift 1 · Q13 · MCQ
In the cell Pt $∣ (s) ∣$ $H_{2}$ (g, 1 bar) $∣ H C l (a q) ∣$ AgCl $∣ (s) ∣$ Ag(s)|Pt(s) the cell potential is 0.92 V when a 10–6 molal $H C l$ solution is used.…2019 · 10 Jan · Shift 2 · Q11 · MCQ
For the cell Zn(s) |Zn2+ (aq)| |Mx+ (aq)| M(s), different half cells and their standard electrode potentials are given below : If $E_{z n^{2 +} / z n}^{0}$ = $-$ 0.76 V, which cathode will give maximum value of Eocell per electron transferred? Includes table2019 · 11 Jan · Shift 1 · Q5 · MCQ
Given the equilibrium constant: KC of the reaction : $C u$ (s) + 2 $A g^{+}$ (aq) $\to$ $C u^{2 +}$ (aq) + 2 $A g$ (s) is 10 $\times$ 1015, calculate the E $_{ce l l}^{0}$ of this reaciton at 298 K [2.303 $\frac{R T}{F}$ at 298 K = 0.059V]2019 · 11 Jan · Shift 2 · Q11 · MCQ
Given $C O_{3}^{+}$ + e– $\to$ $C O^{2 +}$ ; Eo = + 1.81 V $P b^{4 +}$ + 2e– $\to$ $P b^{2 +}$ ; Eo = + 1.67 V $C e^{4 +}$ + e– $\to$ $C e^{3 +}$ ; Eo = + 1.61 V $B i^{3 +}$ + 3e– $\to$ $B i$ ; Eo = + 0.20 V Oxidizing power of the species will increase in…2019 · 12 Apr · Shift 1 · Q3 · MCQ
The standard electrode potential $E^{o}$ and its temperature coefficient $(\frac{d E ^{o}}{d T})$ for a cell are 2V and $-$ 5 $\times$ 10 $-$ 4 VK $-$ 1 at 300 K respectively. The cell reaction is $Z n$ (s) + $C u^{2 +}$ …2019 · 12 Jan · Shift 1 · Q7 · MCQ
$\land_{m}^{\circ}$ for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm2 mol–1, respectively. If the conductivity of 0.001 M HA is- 5 $\times$ 10–5 S cm–1, degree of dissociation of HA is -2019 · 12 Jan · Shift 2 · Q23 · MCQ
When an electric currents passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current passed, in ampere, is :2018 · 15 Apr · Shift 1 · Q13 · MCQ
When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is :2018 · 16 Apr · Shift 1 · Q10 · MCQ
How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)2018 · Shift 0 · Q15 · MCQ
Consider the following standard electrode potentials (Eo in volts) in aqueous solution : Based on these data, which of the following statements is correct ? Includes table2017 · 8 Apr · Shift 1 · Q10 · MCQ
What is the standard reduction potential (Eo) for $F e^{3 +}$ $\to$ Fe ? Given that : $F e^{2 +}$ + 2e $- \to$ Fe; $E_{F e^{2 +} / F e}^{o}$ = $-$ 0.47 V $F e^{3 +}$ + e $- \to$ $F e^{2 +}$ ; $E_{F e^{3 +} / F e^{2 +}}^{o}$ = +0.77 V2017 · 8 Apr · Shift 1 · Q14 · MCQ
To find the standard potential of $M^{3 +}$ /M electrode,the following cell is constituted : Pt/M/ $M^{3 +}$ (0.001 mol L−1 )/ $A g^{+}$ (0.01 mol L−1 )/Ag The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half…2017 · 9 Apr · Shift 1 · Q13 · MCQ
Given $E_{C l_{2} / C l^{-}}^{o}$ = 1.36 V, $E_{C r^{3 +} / C r}^{o}$ = - 0.74 V $E_{C r_{2} O_{7}^{2 -} / C r^{3 +}}^{o}$ = 1.33 V, $E_{M n O_{4}^{-} / M n^{2 +}}^{o}$ = 1.51 V Among the following, the strongest reducing agent is :2017 · Shift 0 · Q17 · MCQ
What will occur if a block of copper metal is dropped into a beaker containing a solution of 1M $Z n S O_{4}$ ?2016 · 9 Apr · Shift 1 · Q17 · MCQ
Identify the correct statement :2016 · 10 Apr · Shift 1 · Q11 · MCQ
Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP (1 atm and 273 K) is…2016 · 10 Apr · Shift 1 · Q16 · MCQ
Galvanization is applying a coating of :2016 · Shift 0 · Q2 · MCQ
Two Faraday of electricity is passed through a solution of $C u S O_{4}$ . The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu)2015 · Shift 0 · Q7 · MCQ
Resistance of 0.2 M solution of an electrolyte is 50 $Ω$ . The specific conductance of the solution is 1.4 S m-1. The resistance of 0.5 M solution of the same electrolyte is 280 $Ω$ . The molar conductivity of 0.5 M solution of the…2014 · Shift 0 · Q1 · MCQ
The equivalent conductance of NaCl at concentration C and at infinite dilution are $λ_{C}$ and $λ_{\infty}$ , respectively. The correct relationship between $λ_{C}$ and $λ_{\infty}$ is given as: (where the…2014 · Shift 0 · Q23 · MCQ
Given below are the half-cell reactions: $M n^{2 +}$ + 2e- $\to$ $M n$ ; Eo = -1.18 V 2( $M n^{3 +}$ + e- $\to$ $M n^{2 +}$ ); Eo = +1.51 V The Eo for 3 $M n^{2 +}$ $\to$ $M n$ + 2 $M n^{3 +}$ will be :2014 · Shift 0 · Q7 · MCQ
Given $E_{C r^{2 +} / C r}^{o}$ = -0.74 V; $E_{M n O_{4}^{-} / M n^{2 +}}^{o}$ = 1.51 V $E_{C r_{2} O_{7}^{2 -} / C r^{3 +}}^{o}$ = 1.33 V; $E_{C l / C l^{-}}^{o}$ = 1.36 V Based on the data given above, strongest oxidising agent will be :2013 · Shift 0 · Q15 · MCQ
The standard reduction potentials for $Z n^{2 +}$ / $Z n$ , $N i^{2 +}$ / $N i$ , and $F e^{2 +}$ / $F e$ are –0.76, –0.23 and –0.44 V respectively. The reaction X + $Y^{2 +}$ $\to$ $X^{2 +}$ + Y will be spontaneous when :2012 · Shift 0 · Q8 · MCQ
The reduction potential of hydrogen half cell will be negative if :2011 · Shift 0 · Q23 · MCQ
The Gibbs energy for the decomposition of $A l_{2} O_{3}$ at 500oC is as follows : $\frac{2}{3} A l_{2} O_{3} \to \frac{4}{3} A l + O_{2}$ , $Δ_{r} G$ = + 966 kJ mol–1 The potential difference needed for electrolytic reduction of $A l_{2} O_{3}$ at 500oC…2010 · Shift 0 · Q20 · MCQ
The correct order of $E_{M^{2 +} / M}^{o}$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is :2010 · Shift 0 · Q21 · MCQ
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is $C H_{3} O H$ (l) + 3/2 $O_{2}$ $\to$ $C O_{2}$ (g) + 2 $H_{2} O$ (l) At 298K standard Gibb’s energies of formation for $C H_{3} O H$ (l), $H_{2} O$ (l) and $C O_{2}$ (g)…2009 · Shift 0 · Q20 · MCQ
Given : $E_{F e^{3 +} / F e}^{o}$ = -0.036V; $E_{F e^{2 +} / F e}^{o}$ = -0.439 V The value of standard electrode potential for the change, $F e^{3 +}$ (aq) + e- $\to$ $F e^{2 +}$ (aq) will be2009 · Shift 0 · Q21 · MCQ
Given $E_{C r^{3 +} / C r}^{o}$ = -0.72 V; $E_{F e^{2 +} / F e}^{o}$ = -0.42V, The potential for the cell Cr | $C r^{3 +}$ (0.1M) || $F e^{2 +}$ (0.01 M) | Fe is2008 · Shift 0 · Q23 · MCQ
The cell, $Z n$ | $Z n^{2 +}$ (1M) || $C u^{2 +}$ (1M) | $C u$ ( $E_{ce l l}^{o}$ = 1.10V) was allowed to be completely discharged at 298 K. The relative concentration of $Z n^{2 +}$ to $C u^{2 +}$ $[\frac{[ Z n ^{2 +} ]}{[ C u ^{2 +} ]}]$ …2007 · Shift 0 · Q27 · MCQ
The equivalent conductances of two strong electrolytes at infinite dilution in $H_{2} O$ (where ions move freely through a solution) at 25oC are given below: $\land_{C H_{3} C O O N a}^{o}$ = 91.0 S cm2/equiv $\land_{H C l}^{o}$ = 426.2 S cm2/equiv…2007 · Shift 0 · Q28 · MCQ
The molar conductivities $\land_{N a O A c}^{o}$ and $\land_{H C l}^{o}$ and at infinite dilution in water at 25oC are 91.0 and 426.2 Scm2/mol respectively. To calculate $\land_{H O A c}^{o}$ , the additional value required is2006 · Shift 0 · Q31 · MCQ
Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 $Ω$ . The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is…2006 · Shift 0 · Q33 · MCQ
Given the data at 25oC, $A g$ + $I^{-}$ $\to$ $A g I$ + e- , Eo = 0.152 V $A g$ $\to$ $A g^{+}$ + e-, Eo = -0.800 V What is the value of log Ksp for $A g I$ ? (2.303 RT/F = 0.059 V)2006 · Shift 0 · Q7 · MCQ
For a spontaneous reaction the ∆G , equilibrium constant (K) and $E_{ce l l}^{o}$ will be respectively2005 · Shift 0 · Q33 · MCQ
Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is $A l^{3 +}$ + 3 $e^{-}$ $\to$ Alo To prepare 5.12 kg of aluminium metal by this method would…2005 · Shift 0 · Q34 · MCQ
The highest electrical conductivity of the following aqueous solutions is of :2005 · Shift 0 · Q35 · MCQ
Calculate $\land_{H O A c}^{\infty}$ Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25oC Includes table2005 · Shift 0 · Q36 · MCQ
In a hydrogen – oxygen fuel cell, combustion of hydrogen occurs to :2004 · Shift 0 · Q35 · MCQ
Consider the following Eo values $E_{F e^{3 +} / F e^{2 +}}^{o}$ = 0.77 V; $E_{S n^{2 +} / S n}^{o}$ = -0.14 V Under standard conditions the potential for the reaction $S n$ (s) + 2 $F e^{3 +}$ (aq) $\to$ 2 $F e^{2 +}$ (aq) + $S n^{2 +}$ (aq) is :2004 · Shift 0 · Q36 · MCQ
The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at 25oC. The equilibrium constant of the reaction is (F = 96,500 C mol-1: R = 8.314 JK-1 mol-1)2004 · Shift 0 · Q37 · MCQ
The limiting molar conductivities Λ° for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectively. The Λ° for NaBr is2004 · Shift 0 · Q38 · MCQ
In a cell that utilises the reaction $Z n$ (s) + 2 $H^{+}$ (aq) $\to$ $Z n^{2 +}$ (aq) + $H_{2}$ (g) addition of $H_{2} S O_{4}$ to cathode compartment, will2004 · Shift 0 · Q39 · MCQ
The $E_{M^{3 +} / M^{2 +}}^{o}$ values for Cr, Mn, Fe and Co are – 0.41, +1.57, + 0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state form +2 to +3 is easiest?2004 · Shift 0 · Q40 · MCQ
For a cell reaction involving a two-electron change, the standard e.m.f. of the cell is found to be 0.295 V at 25oC. The equilibrium constant of the reaction at 25oC will be2003 · Shift 0 · Q33 · MCQ
Standard reduction electrode potentials of three metals A,B&C are respectively +0.5 V, -3.0 V & -1.2 V. The reducing, powers of these metals are2003 · Shift 0 · Q34 · MCQ
When during electrolysis of a solution of $A g N O_{3}$ , 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be :2003 · Shift 0 · Q35 · MCQ
For the redox reaction $Z n$ (s) + $C u^{2 +}$ (0.1 M) $\to$ $Z n^{2 +}$ (1M) + $C u$ (s) taking place in a cell, $E_{ce l l}^{o}$ is 1.10 volt. Ecell for the cell will be ( $2.303 \frac{R T}{F}$ = 0.0591)2003 · Shift 0 · Q36 · MCQ
Several blocks of magnesium are fixed to the bottom of a ship to :2003 · Shift 0 · Q37 · MCQ
Conductivity (Seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then, then constant of proportionality is expressed in :2002 · Shift 0 · Q31 · MCQ