Electrolysis of a solution of in aqueous sulphuric acid is a method for the…

CHEMISTRY · Multi-part · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

Electrolysis of a solution of

\text{MnSO}_4

in aqueous sulphuric acid is a method for the preparation of

\text{MnO}_2

as per reaction,

\text{Mn}^{2+}(\text{aq.}) + 2\text{H}_2\text{O} \longrightarrow \text{MnO}_2(\text{s}) + 2\text{H}^+(\text{aq.}) + \text{H}_2(\text{g})

Passing a current of 27 A for 24 hours gives one kg of

\text{MnO}_2

. (1) What is the value of current efficiency? (2) Write the reaction taking place at the cathode and at the anode.