Electrochemistry

The approximate time duration in hours to electroplate 20 g of calcium from molten calcium chloride using a current of 4 A is (Atomic mass of $\mathrm{Ca}=40$ )

A current of 4.0 A is passed through 0.5 L of 0.2 M NaCl solution for 1200 s . Calculate the pH of the solution after electrolysis.

The pH of 0.5 L of 1.0 M NaCl solution after .electrolysis for 965 s using 5.0 A current is,

Calculate the molarity of a solution containing 5 g of NaOH dissolved in the product of $ \mathrm{H}_{2}-\mathrm{O}_{2} $ fuel cell operated at 1 A current for 595.1 hours. (Assume $ \mathrm{F}=96500 \mathrm{C} / \mathrm{mol} $ of electron ...

The equilibrium constant of the reaction
\(A(s)+2 B^{+}(a q) \rightleftharpoons A^{2+}(a q)+2 B(s)\)
\(E_{\text {cell }}^{\circ}=0.0295 \mathrm{~V} \text { is } \quad\left[\frac{2.303 R T}{F}=0.059\right]\)

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.
E\(^\Theta\) values Fe3+ / Fe2+ = + 0.77; I2 / I\(-\) = + 0.54 Cu2+ / Cu = + 0.34; Ag+ / Ag = 0.80 V

Given, the reduction potential of Na+, Mg2+, Al3+ and Ag+ as \(E_{N{a^ + }/Na}^o\) = \(-\) 2.17 V; \(E_{M{g^{2 + }}/Mg}^o\) = \(-\) 2.37 V; \(E_{A{g^ + }/Ag}^o\) = \(-\) 0.08 V.
The least stable oxide is

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is (Atomic mass of Ca = 40)

The molar conductivities of KCl, NaCl and KNO3 are 152, 128 and 111 S cm2 mol\(-\)1 respectively. What is the molar conductivity of NaNO3?

A solution of copper sulphate is electrolyzed between copper electrodes by a current of 10.0A passing for one hour. Which of the following statements is correct regarding the changes occur at the electrodes and in the solution?