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Electrochemistry

69 questions · Chemistry · NEET

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Electrochemistry

Electrochemistry

69 questions · Chemistry · NEET

Match List I with List II. Choose the correct answer from the options given below : Includes table2024 · Q114 · MCQ
Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is (Given : Molar mass of $Cu : 63 g mol^{- 1}, 1 F = 96487 C$ …2024 · Q138 · MCQ
From the following select the one which is not an example of corrosion.2024 · Q109 · MCQ
The standard cell potential of the following cell $Zn Zn^{2 +} (aq) Fe^{2 +} (aq) ∣ Fe$ is $Zn (s) + Fe^{2 +} (aq) \to Zn^{2 +} (aq) + Fe (s)$ . Calculate the standard Gibbs energy change for the reaction: $Zn (s) + Fe^{2 +} (aq) \to Zn^{2 +} (aq) + Fe (s)$ …2024 · Q140 · MCQ
The $E^{Θ}$ values for $Al^{+} / Al = + 0.55 V and Tl^{+} / Tl = - 0.34 V Al^{3 +} / Al = - 1.66 V and T^{3 +} / Tl = + 1.26 V$ …2023 · Q93 · MCQ
Molar conductance of an electrolyte increase with dilution according to the equation: $Λ_{m} = Λ_{m}^{\circ} - A c$ Which of the following statements are true? (A) This equation applies…2023 · Q95 · MCQ
The correct value of cell potential in volt for the reaction that occurs when the following two half cells are connected, is $Fe_{(aq)}^{2 +} + 2 e^{-} \to Fe (s), E^{\circ} = - 0.44 V Cr_{2} O_{7}^{2 -} (aq) + 14 H^{+} + 6 e^{-} \to 2 Cr^{3 +} + 7 H_{2} O E^{\circ} = + 1.33 V$ …2023 · Q96 · MCQ
The conductivity of centimolar solution of $KCl$ at $2 5^{\circ} C$ is $0.0210 ohm^{- 1} cm^{- 1}$ and the resistance of the cell containing the solution at $2 5^{\circ} C$ is $60 ohm$ …2023 · Q87 · MCQ
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A : In equation $Δ_{r} G = - nF E_{cell}$ , value of $Δ_{r} G$ depends on n. Reason R : $E_{cell}$ …2023 · Q98 · MCQ
Standard electrode potential for the cell with cell reaction Zn(s) + Cu2+(aq) $\to$ Zn2+(aq) + Cu(s) is 1.1 V. Calculate the standard Gibbs energy change for the cell reaction. (Given F = 96487 C mol $-$ 1)2022 · Q131 · MCQ
Two half cell reactions are given below. $C o^{3 +} + e^{-} \to C o^{2 +}, E_{C o^{2 +} / C o^{3 +}}^{0} = - 1.81 V$ $2 A l^{3 +} + 6 e^{-} \to 2 A l (s), E_{A l / A l^{3 +}}^{0} = + 1.66 V$ The standard EMF…2022 · Q99 · MCQ
At 298 K, the standard electrode potentials of Cu2+ / Cu, Zn2+ / Zn, Fe2+ / Fe and Ag+ / Ag are 0.34 V, $-$ 0.76 V, $-$ 0.44 V V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction…2022 · Q107 · MCQ
Given below are half cell reactions: $M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O$ , $E_{M n^{2 +} / M n O_{4}^{-}}^{o} = - 1.510 V$ $\frac{1}{2} O_{2} + 2 H^{+} + 2 e^{-} \to H_{2} O$ $E_{O_{2} / H_{2} O}^{o} = + 1.223 V$ Will…2022 · Q111 · MCQ
Find the emf of the cell in which the following reaction takes place at 298 K Ni(s) + 2Ag+ (0.001 M) $\to$ Ni2+ (0.001 M) + 2Ag(s) (Given that E $_{ce l l}^{o}$ = 10.5 V, $\frac{2.303 R T}{F} = 0.059$ at 298 K)2022 · Q120 · MCQ
The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol $-$ 1. What is the dissociation constant of acetic acid? Choose the correct option. [ $Λ_{H^{+}}^{o}$ = 350 S cm2 mol $-$ 1 $Λ_{C H_{3} C O O^{-}}^{o}$ = 50 S cm2 mol $-$ 1]2021 · Q123 · MCQ
The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol $-$ 1 respectively. The molar conductance of CH3COOH at infinite dilution is. Choose the right option for your answer.2021 · Q97 · MCQ
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be :2020 · Q89 · MCQ
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is :2020 · Q98 · MCQ
For a cell involving one electron $E_{ce l l}^{Θ}$ = 0.59 V at 298 K, the equilibrium constant for the cell reaction is : [Given that $\frac{2.303 R T}{F}$ = 0.059 V at T = 298 K ]2019 · Q83 · MCQ
For the cell reaction 2Fe3+(aq) + 2I– (aq) $\to$ 2Fe2+(aq) + I2(aq) $E_{ce l l}^{Θ}$ = 0.24 V at 298 K. The standard Gibbs energy ( $Δ$ rGo) of the cell reaction is : [Given that Faraday constant F = 96500 C mol–1]2019 · Q85 · MCQ
Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram : Then the species undergoing disproportionation is : Includes diagram2018 · Q109 · MCQ
In the electrochemical cell : $Z n ∣ Z n S O_{4} (0.01 M) ∣$ $∣ C u S O_{4} (1.0 M) ∣ C u,$ the emf of this Daniell cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of…2017 · Q90 · MCQ
The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is2016 · Q89 · MCQ
If the Eocell for a given reaction has a negative value, which of the following gives the correct relationships for the values of $Δ$ Go and Keq ?2016 · Q80 · MCQ
The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 $\times$ 10 $-$ 3 S cm $-$ 1 at 298 K is2016 · Q89 · MCQ
During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is2016 · Q90 · MCQ
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because2016 · Q91 · MCQ
The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 $\times$ 10 $-$ 19C)2016 · Q92 · MCQ
Aqueous solution of which of the following compounds is the best conductor of electric current ?2015 · Q99 · MCQ
A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as2015 · Q77 · MCQ
The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be2014 · Q92 · MCQ
When 0.1 mol MnO $_{4}^{2 -}$ is oxidised the quantity of electricity required to completely oxidise MnO $_{4}^{2 -}$ to MnO $_{4}^{-}$ is2014 · Q93 · MCQ
Consider the half-cell reduction reaction Mn2+ + 2e $-$ $\to$ Mn, Eo = $-$ 1.18 V Mn2+ $\to$ Mn3+ + e $-$ , Eo = $-$ 1.51 V The $E$ o for the reaction 3 Mn2+ $\to$ Mno + 2Mn3+, and possibility of the forward reaction are respectively2013 · Q88 · MCQ
How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = 96,500 C; Atomic mass of Co = 59 u)2013 · Q89 · MCQ
At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm $-$ 1 cm2 mol $-$ 1 and at infinite dilution its molar conductance is 238 ohm $-$ 1 cm2 mol $-$ 1. The degree of ionisation of ammonium hydroxide at the same…2013 · Q87 · MCQ
A button cell used in watches function as following. Zn(s) + Ag2O(s) + H2O(l) $⇌$ 2Ag(s) + Zn2+(aq) + 2OH $-$ (aq) If half cell potentials are Zn2+(aq) + 2e $-$ $\to$ Zn(s); Eo = $-$ 0.76 V Ag2O(s) + H2O(l) + 2e $-$ $\to$ …2013 · Q88 · MCQ
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be2013 · Q89 · MCQ
Molar conductivities $(Λ_{m}^{o})$ at infinite dilution of NaCl, Hcl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol $-$ 1 respectively. $(Λ_{m}^{o})$ for CH3COOH will be2012 · Q66 · MCQ
The Gibb's energy for the decomposition of Al2O3 at 500oC is as follows $\frac{2}{3}$ Al2O3 $\to$ $\frac{4}{3}$ Al + O2 $Δ$ rG = +960 kJ mol $-$ 1 The potential difference needed for the electrolytic reduction of aluminium oxide…2012 · Q67 · MCQ
Standard reduction potentials of the half reactions are given below : F2(g) + 2e $-$ $\to$ 2F $-$ (aq) ; Eo = + 2.85 V Cl2(g) + 2e $-$ $\to$ 2Cl $-$ (aq) ; Eo = + 1.36 V Br2(l) + 2e $-$ $\to$ 2Br $-$ (aq) ; Eo = + 1.06 V I2(s) + 2e $-$ $\to$ …2012 · Q68 · MCQ
Limiting molar conductivity of NH4OH $[$ i.e. $Λ_{m (N H_{4} O H)}^{0}$ $]$ is equal to2012 · Q100 · MCQ
A solution contains Fe2+, Fe3+ and I $-$ ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is + 0.77 V and Eo for I2/2I $-$ = 0.536 V. The favourable redox reaction is2011 · Q65 · MCQ
Standard electrode potential of three metals X, Y and Z are $-$ 1.2 V, + 0.5 V and $-$ 3.0 V respectively. The reducing power of these metals will be2011 · Q93 · MCQ
Standard electrode potential for Sn4+/Sn2+ couple is + 0.15 V and that for the Cr3+/Cr couple is $-$ 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be2011 · Q94 · MCQ
The electrode potentials for Cu2+(aq) + e $-$ $\to$ Cu+(aq) and Cu+(aq) + e $-$ $\to$ Cu(s) are + 0.15 V and + 0.50 V respectively. The value of Eocu2+/cu will be2011 · Q95 · MCQ
Consider the following relations for emf of an electrochemical cell (i) EMF of cell = (Oxidation potential of anode) $-$ (Reduction potential of cathode) (ii) EMF of cell = (Oxidation potential of anode) + (Reduction potential of cathode)…2010 · Q55 · MCQ
Which of the following expressions correctly represents the equivalent conductance at infinite diluation of Al2(SO4)3. Given that $Λ \circ$ Al3+ and $Λ \circ$ so $_{4}^{2 -}$ are the…2010 · Q56 · MCQ
For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25oC. The value of standard Gibb's energy, $Δ$ Go will be (F = 96500 C mol $-$ 1)2010 · Q105 · MCQ
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to2010 · Q96 · MCQ
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 $\times$ 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is product? (Assume 100% current efficiency, at mass of Al =…2009 · Q89 · MCQ
Given : (i) Cu2+ + 2e $-$ $\to$ Cu, Eo = 0.337 V (ii) Cu2+ + e $-$ $\to$ Cu+, Eo = 0.153 V Electrode potential, Eo for the reaction, Cu+ + e $-$ $\to$ Cu, will be2009 · Q97 · MCQ
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is2009 · Q98 · MCQ
On the basis of the following Eo values, the strongest oxidizing agent is [Fe(CN)6]4 $-$ $\to$ [Fe(CN)6]3 $-$ + e $-$ ; Eo = $-$ 0.35 V Fe2+ $\to$ Fe3+ + e $-$ ; Eo = $-$ 0.77 V2008 · Q97 · MCQ
Kohlrausch's law states that at2008 · Q98 · MCQ
Standard free energies of formation (in kJ/mol) at 298 K are $-$ 237.2, $-$ 394.4 and $-$ 8.2 for H2O(l), CO2(g) and pentane (g) respectively. The value of Eocell for the pentane-oxygen fuel cell is2008 · Q99 · MCQ
The equilibrium constant of the reaction: Cu(s) + 2Ag+(aq) $\to$ Cu2+(aq) + 2Ag(s); Eo = 0.46 V at 298 K is2007 · Q86 · MCQ
The efficiency of a fuel cell is given by2007 · Q87 · MCQ
EoFe2+/Fe = $-$ 0.441 V and EoFe3+/Fe2+ = 0.771 V, the standard EMF of the reaction Fe + 2Fe3+ $\to$ 3Fe2+ will be2006 · Q98 · MCQ
A hypothetical electrochemical cell is shown below. $A ∣ A^{+} (x M) ∣ ∣ B^{+} (y M) ∣ B$ The emf measured is + 0.20 V. The cell reaction is2006 · Q99 · MCQ
4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H ions in solution by the same quantity of electric charge will be2005 · Q92 · MCQ
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass : Al = 27)2005 · Q93 · MCQ
The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibrium constant of the reaction would be2004 · Q89 · MCQ
The e.m.f. of a Daniell cell at 298 K is E1. When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2? Includes diagram2003 · Q100 · MCQ
On the basis of the information available from the reaction, 4/3Al + O2 $\to$ 2/3Al2O3, $Δ$ G = $-$ 827 kJ mol $-$ 1 of O2, the minimum e.m.f. required to carry out an electrolysis of Al2O3 is (F = 96500 C mol $-$ 1)2003 · Q101 · MCQ
In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam2002 · Q98 · MCQ
Standard electrode potentials are Fe2+/Fe [Eo = $-$ 0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are kept together, then2001 · Q97 · MCQ
Cell reaction is spontaneous when2000 · Q112 · MCQ
Equivalent conductances of Ba2+ and Cl $-$ ions are 127 and 76 ohm $-$ 1 cm $-$ 1 eq $-$ 1 respectively. Equivalent conductance of BaCl2 at infinite dilution is2000 · Q95 · MCQ
For the disproportionation of copper 2Cu+ $\to$ Cu2+ + Cu, Eo is (Given Eo for Cu2+/Cu is 0.34 V and Eo for Cu2+/Cu+ is 0.15 V.)2000 · Q96 · MCQ