Electrolytic Cells and Electrolysis

Castner-Kellner cell is used for the preparation of

Number of Faraday required to reduce 0.5 mole of MnO₄⁻ to MnO₂ is

Number of Faradays required for conversion of 0.5 mol Cr₂O₇²⁻ ion into Cr³⁺ ion is