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Question

Question: The charge required for reducing 1 mole of \(MnO_{4}^{-}\) to \(Mn^{2 +}\) is...

The charge required for reducing 1 mole of MnO4MnO_{4}^{-} to Mn2+Mn^{2 +} is

A

1.93×105C1.93 \times 10^{5}C

B

2.895×105C2.895 \times 10^{5}C

C

4.28×105C4.28 \times 10^{5}C

D

4.825×105C4.825 \times 10^{5}C

Answer

4.825×105C4.825 \times 10^{5}C

Explanation

Solution

MnO41mole+5e5molesMn2+1mole\underset{1mole}{MnO_{4}^{-}} + \underset{5moles}{5e^{-}} \rightarrow \underset{1mole}{Mn^{2 +}}

5 moles of electrons are needed for reduction of 1 mole of MnO4MnO_{4}^{-} to Mn2+Mn^{2 +}

5 moles of electrons = 5 Faradays

Quantity of charge required =5×96500= 5 \times 96500

=4.825×105Coulombs= 4.825 \times 10^{5}Coulombs