Question

For reducing one mole of Fe2+ ion to Fe the number of Faraday of electricity is​

Answer 1

Explanation:

Fe2+ /Fe acts as anode because its standard reduction potential is low i.e., oxidation occurs at this electrode and Fe3+/Fe acts as cathode because its standard reduction potential is high i.e., reduction occurs at this electrode.

∴Fe→Fe2++2e−(Anode)

and(Fe3++e−→Fe2+)×2(Cathode)Fe+2Fe3+→3Fe2+

Thus, if Fe2+, Fe3+and Fe blocks are kept together Fe3+ get reduced to Fe2+ i.e., concentration of Fe3+ decreases.