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Electrochemistry

33 questions · Chemistry · JEE Advanced

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JEE Advanced
Chemistry
Electrochemistry

Electrochemistry

33 questions · Chemistry · JEE Advanced

In an electrochemical cell, dichromate ions in aqueous acidic medium are reduced to $C r^{3 +}$ . The current (in amperes) that flows through the cell for 48.25 minutes to produce 1 mole of $C r^{3 +}$ is . Use: 1…2025 · Shift 1 · Q8 · Numerical
An electrochemical cell is fueled by the combustion of butane at 1 bar and 298 K . Its cell potential is $\frac{X}{F} \times 1 0^{3}$ volts, where $F$ is the Faraday constant. The value of $X$ is …2025 · Shift 2 · Q14 · Numerical
In a conductometric titration, small volume of titrant of higher concentration is added stepwise to a larger volume of titrate of much lower concentration, and the conductance is measured after each addition. The limiting ionic… Includes table Includes diagram2024 · Shift 1 · Q14 · MCQ
An aqueous solution of hydrazine $(N_{2} H_{4})$ is electrochemically oxidized by $O_{2}$ , thereby releasing chemical energy in the form of electrical energy. One of the products generated from the…2024 · Shift 2 · Q5 · Multiple correct
Plotting $1/ Λ_{m}$ against $c Λ_{m}$ for aqueous solutions of a monobasic weak acid $y$ resulted in a straight line with $y$ -axis intercept of $P$ and slope of $S$ …2023 · Shift 1 · Q5 · MCQ
The reduction potential $(E^{0}$ , in $V)$ of $MnO_{4}^{-} (aq) / Mn (s)$ is . [Given: $E_{(MnO_{4}^{-} (aq) / MnO_{2} (s))}^{0} = 1.68 V; E_{(MnO_{2} (s) / Mn^{2 +} (aq))}^{0} = 1.21 V; E_{(Mn^{2 +} (aq) / Mn (s))}^{0} = - 1.03 V$ …2022 · Shift 1 · Q2 · Numerical
Consider the strong electrolytes $Z_{m} X_{n}, U_{m} Y_{p}$ and $V_{m} X_{n}$ . Limiting molar conductivity ( $Λ^{0}$ ) of $U_{m} Y_{p}$ and $V_{m} X_{n}$ are 250… Includes table Includes diagram2022 · Shift 2 · Q3 · Numerical
Some standard electrode potentials at 298 K are given below : $P b^{2 +}$ / $P b$ = $-$ 0.13 V $N i^{2 +}$ / $N i$ = $-$ 0.24 V $C d^{2 +}$ / $C d$ = $-$ 0.40 V $F e^{2 +}$ / $F e$ = $-$ 0.44 V To a solution containing 0.001 M of $X^{2 +}$ and 0.1 M of $Y^{2 +}$ …2021 · Shift 2 · Q4 · Multiple correct
At 298 K, the limiting molar conductivity of a weak monobasic acid is 4 $\times$ 102 S cm2 mol $-$ 1. At 298 K, for an aqueous solution of the acid the degree of dissociation is $α$ and the molar conductivity is y $\times$ 102 S cm2…2021 · Shift 2 · Q7 · Numerical
At 298 K, the limiting molar conductivity of a weak monobasic acid is 4 $\times$ 102 S cm2 mol $-$ 1. At 298 K, for an aqueous solution of the acid the degree of dissociation is $α$ and the molar conductivity is y $\times$ 102 S cm2…2021 · Shift 2 · Q8 · Numerical
Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K. Its cell reaction is $H_{2} (g) + \frac{1}{2} O_{2} (g) H_{2} O (l)$ The work derived from the cell on the consumption of…2020 · Shift 1 · Q15 · Numerical
Molar conductivity ( $Λ$ m) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentrations (C) of sodium stearate. Which one of the following plots provides the correct…2019 · Shift 1 · Q4 · MCQ
For the electrochemical cell, $M g (s) ∣ M g^{2 +} (a q, 1 M) C u^{2 +} (a q, 1 M) ∣ C u (s)$ the standard $e m f$ of the cell is $2.70 V$ at $300 K .$ …2018 · Shift 1 · Q8 · Numerical
Consider an electrochemical cell : $A (s) ∣ A^{n +} (a q, 2 M) ∣ B^{2 n +} (a q, 1 M) ∣ B (s) .$ The value of $Δ H^{\circ}$ for the cell reaction is twice…2018 · Shift 2 · Q12 · Numerical
The conductance of a $0.0015 M$ aqueous solution of a weak monobasic acid was determined by using a conductivity cell consisting of platinized $P t$ electrodes. The distance between the electrodes is $120 c m$ with an area of cross section of $1 c m^{2} .$ …2017 · Shift 1 · Q6 · Numerical
For the following cell, $Z n (s) ∣ Z n S O_{4} (a q) ∣ ∣ C u S O_{4} (a q) ∣ C u (s)$ when the concentration of $Z n^{2 +}$ is $10$ times the concentration of $C u^{2 +},$ …2017 · Shift 2 · Q17 · MCQ
For the following electrochemical cell at 298 K Pt(s) | $H_{2}$ (g, 1 bar) | $H^{+}$ (aq, 1 M) || $M^{4 +}$ (aq), $M^{2 +}$ (aq) | Pt (s) Ecell = 0.092 V when ${{\ left[ {{M^{2 + }}(aq)} \right]} \over {\left[ {{M^{4 + }}(aq)} \right]}}$ = 10x…2016 · Shift 2 · Q2 · MCQ
All the energy released from the reaction $X \to Y, Δ_{t} G^{o}$ = -193 kJ mol-1 is used for oxidizing M $^{+}$ as M $^{+}$ $\to$ M $^{3 +}$ + 2e-, Eo = -0.25 V Under standard conditions, the number of moles of M $^{+}$ oxidized when one mole…2015 · Shift 1 · Q3 · Numerical
The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY (0.10 M). If $λ_{x^{-}}^{0} \approx λ_{y^{-}}^{0}$ the difference in their pKa…2015 · Shift 2 · Q3 · Numerical
In a galvanic cell, the salt bridge2014 · Shift 1 · Q2 · Multiple correct
An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List – I. The variation in conductivity of these reactions in List – II. Match List – I with List – II and select the correct answer using the code given…2013 · Shift 2 · Q3 · MCQ
The standard reduction potential data at 25oC is given below: Eo ( $F e^{3 +}$ , $F e^{2 +}$ ) = +0.77V; Eo ( $F e^{2 +}$ , $F e$ ) = -0.44V; Eo ( $C u^{2 +}$ , $C u$ ) = +0.34V; Eo ( $C u^{+}$ , $C u$ ) = +0.52V; Eo [ $O_{2}$ (g) + $H^{+}$ + 4e- $\to$ 2 $H_{2} O$ ] =…2013 · Shift 2 · Q4 · MCQ
The electrochemical cell shown below is a concentration cell. M | $M^{2 +}$ (saturated solution of a sparingly soluble salt, $M X_{2}$ ) || $M^{2 +}$ (0.001 mol dm–3) | M The emf of the cell depends on the difference in concentrations of…2012 · Shift 2 · Q2 · MCQ
The electrochemical cell shown below is a concentration cell. M | $M^{2 +}$ (saturated solution of a sparingly soluble salt, $M X_{2}$ ) || $M^{2 +}$ (0.001 mol dm–3) | M The emf of the cell depends on the difference in concentrations of…2012 · Shift 2 · Q3 · MCQ
$A g N O_{3}$ (aq.) was added to an aqueous $K C l$ solution gradually and the conductivity of the solution was measured. The plot of conductance ( $Λ$ ) versus the volume of $A g N O_{3}$ is Includes diagram2011 · Shift 1 · Q12 · MCQ
Consider the following cell reaction: 2Fe(s) + $O_{2}$ (g) + 4 $H^{+}$ (aq) $\to$ 2 $F e^{2 +}$ (aq) + 2 $H_{2} O$ (l); Eo = 1.67 V At [ $F e^{2 +}$ ] = 10-3 M, P( $O_{2}$ ) = 0.1 atm and pH = 3, the cell potential at 25oC is2011 · Shift 2 · Q3 · MCQ
The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and…2010 · Shift 1 · Q10 · MCQ
The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and…2010 · Shift 1 · Q11 · MCQ
For the reduction of NO $_{3}^{-}$ ion in an aqueous solution, E $^{0}$ is + 0.96 V. Values of E $^{0}$ for some metal ions are given below: $V^{2 +} (a q .) + 2 e^{-} \to V F e^{3 +} (a q .) + 3 e^{-} \to F e A u^{3 +} (a q) + 3 e^{-} \to A u H g^{2 +} (a q) + 2 e^{-} \to H g E^{0} = - 1.19 V E^{0} = - 0.04 V E^{0} = + 1.40 V E^{0} = + 0.86 V$ …2009 · Shift 2 · Q5 · Multiple correct
Electrolysis of dilute aqueous NaCl solution was carried out by passing 10 milli ampere current. The time required to liberate 0.01 mol of H $_{2}$ gas at the cathode is (1 Faraday = 96500 C mol $^{- 1}$ ].2008 · Shift 2 · Q8 · MCQ
Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 $\times$ 10 $^{23}$ ) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To…2007 · Shift 1 · Q17 · MCQ
Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 $\times$ 10 $^{23}$ ) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To…2007 · Shift 1 · Q18 · MCQ
Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.023 $\times$ 10 $^{23}$ ) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To…2007 · Shift 1 · Q19 · MCQ