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AIIMS 2016

Exam: AIIMS
Year: 2016
Subject: Chemistry
Chapter: Electrochemistry

AIIMS 2016 · Chemistry · Electrochemistry

How many Faradays of electricity are required for the given...

How many Faradays of electricity are required for the given reaction to occur?

\mathrm{MnO}_4^{-} \longrightarrow \mathrm{Mn}^{2+}

Options

A $5 \mathrm{~F}$
B $3 \mathrm{~F}$
C $1 \mathrm{~F}$
D $7 \mathrm{~F}$

Correct answer

A. $5 \mathrm{~F}$

Step-by-step solution

\stackrel{+7}{\mathrm{MnO}_4^{-}} \longrightarrow \mathrm{Mn}^{2+}

The reaction can be written as :

\mathrm{MnO}_4^{-}+5 e^{-} \longrightarrow \mathrm{Mn}^{2+}

Hence, 5 moles of electrons or

5 \mathrm{~F}

of electricity are required for the given reaction.

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