List of top Physical Chemistry Questions on Electrochemistry asked in GATE CY

In a calibrated pH meter comprising of glass electrode-standard calomel electrode, the potential for a buffer solution of pH 4.01 is measured as 0.814 V at 25\(^{\circ}\)C. For a \(4.0 \times 10^{-3}\) M solution of acetic acid, the measured potential (in V) is (rounded off to three decimal places).
(Given: \(K_a\) of acetic acid at 25\(^{\circ}\)C = \(1.75 \times 10^{-5}\); \(2.303RT/F = 0.059\); Assume: \(a_{H^+} = [H^+]\))

For the following electrochemical cells, liquid junction potentials affect the cell potential (\(E_{cell}\)).
I. \(\mathrm{Electrode\text{-}1 \mid 0.1\ M\ KCl \parallel 0.1\ M\ NaCl \mid Electrode\text{-}2}\)
II. \(\mathrm{Electrode\text{-}1 \mid 0.1\ M\ HCl \parallel 0.01\ M\ HCl \mid Electrode\text{-}2}\)
III. \(\mathrm{Electrode\text{-}1 \mid 0.01\ M\ KCl \parallel 0.01\ M\ HCl \mid Electrode\text{-}2}\)
The correct order of their \(E_{cell}\) at \(25^{\circ}\mathrm{C}\) is

If the ionic mobility of \(\mathrm{Ag^+}\) ion in a very dilute aqueous solution of \(\mathrm{AgNO_3}\) at \(298\ \mathrm{K}\) is \(y\times10^{-8}\ \mathrm{m^2\,V^{-1}\,s^{-1}}\), then the value of \(y\) is (rounded off to two decimal places).

(Given: viscosity of water at \(298\ \mathrm{K} = 8.94\times10^{-4}\ \mathrm{kg\,m^{-1}\,s^{-1}}\); \(k = 1.38\times10^{-23}\ \mathrm{J\,K^{-1}}\); \(F = 96500\ \mathrm{C\,mol^{-1}}\); \(R = 8.314\ \mathrm{J\,mol^{-1}\,K^{-1}}\); Stokes radius of \(\mathrm{Ag^+} = 0.15\ \mathrm{nm}\))