List of top Physical Chemistry Questions on Electrochemistry asked in IIT JAM CY

At pH 7, the reaction for the oxidation of NADH at 298 K and a pressure of 1 atm is given below:

The mobility of Na$^+$ ions in water at 298 K is $5.19 \times 10^{-8}$ m$^2$ s$^{-1}$ V$^{-1}$If the effective radius of a Na$^+$ ion is $Y \times 10^{-12}$ m, the value of $Y$ is _ _ _. (rounded off to two decimal places)

Mobility of ions Li⁺ , Na⁺ , K⁺ , Ag⁺ in water at 298 K follows the order

A salt QCl of a certain metal Q is electrolyzed to its elements. 40 g of metal Q is formed at an electrode. The volume of Cl₂ formed at the other electrode at 1 atm pressure and 298 K is _______ litres. (rounded off to one decimal place)
[Given: The gas constant 𝑅 = 0.082 L atm mol⁻¹ K⁻¹ , the molar mass of Q is 40 g mol⁻¹ and Cl₂ is assumed to be an ideal gas]

In the cell reaction
P⁺(𝑎𝑞)+Q(𝑠)→P(𝑠)+Q⁺(𝑎𝑞)
the EMF of the cell, 𝐸_{𝑐𝑒𝑙𝑙} is zero. The standard EMF of the cell, 𝐸^𝑜_{𝑐𝑒𝑙𝑙} is
[Given:
Activities of all solids are unity.
Activity of P⁺(𝑎𝑞) is 2 M. Activity of Q⁺(𝑎𝑞) is 1 M.
𝑅 = universal gas constant; 𝑇 = temperature; 𝐹 = Faraday constant]

The SI unit of the molar conductivity of an electrolyte solution is

The standard reduction potential (E⁰ ) of Fe³⁺→Fe is____V.
[Given: Fe³⁺→Fe2+ E⁰ = 0.77 V and
Fe²⁺→Fe E⁰=−0.44 V]
(round off to three decimal places)

steady current of 1.25 A is passed through an electrochemical cell for 1.5 h using a 12 V battery. The total charge, Q, drawn during this process is __________ Coulombs. (round off to the nearest integer)

A galvanic electrochemical cell made of Zn²⁺/Zn and Cu²⁺/Cu half-cells produces 1.10 V at 25°C. The ratio of |Zn²⁺| to |Cu²⁺| is maintained at 1.0. The ΔG° for the reaction when 1.0 mol of Zn gets dissolved is____kJ. (round off to the nearest integer)
[Given: Faraday's constant = 96485 C mol^-1]

The mean ionic activity coefficient for a 0.01 M aqueous solution of Ca$_3$(PO$_4$)$_2$ is .......... (Round off to three decimal places) (Given: $ \log_{10} \gamma_{\pm} = -0.509 Z_{\pm}^2 \sqrt{T} $)

For the reaction, CuSO$_4$ (aq) + Zn (s) → ZnSO$_4$ (aq) + Cu (s), the value of $ \Delta G^\circ $ (in kJ mol$^{-1}$) is .......... (Round off to the nearest integer) (Reduction potential: Cu$^{2+}$(aq)/Cu(s) = +0.34 V; Zn$^{2+}$(aq)/Zn(s) = -0.76 V))

The salt bridge in a galvanic cell allows the flow of

The electrolyte AB2 ionises in water as
AB2 $ \rightleftharpoons $ $ A^{2+} + 2B^{-} $
The mean ionic activity coefficient ($ \gamma_{\pm} $) is

With reference to the variation of molar conductivity ($ \Lambda_m $) with concentration for a strong electrolyte in an aqueous solution, the CORRECT statement is

In a saturated calomel electrode, the saturation is with respect to

The emf of a standard cadmium cell is 1.02 V at 300 K. The temperature coefficient of the cell is $ -5.0 \times 10^{-5} \, \text{V K}^{-1} $. The value of $ \Delta H^\circ $ for the cell is ............ kJ mol$^{-1}$ (rounded up to two decimal places).

[1 F = 96500 $C mol^{–1}$]