QJEEM22Ch4b1c: JEE Main 2022 Chemistry - Class 12 JEEM22Ch4b1c Solution: In which of the following half cells, electrochemical reaction…

Question

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In which of the following half cells, electrochemical reaction is pH dependent?

Accepted Answer

Reduction of

\mathrm{MnO}_{4}^{-}

is

\mathrm{pH}

dependent.

In acidic medium

\mathrm{MnO}_{4}^{-}+5 \mathrm{e}^{-} \longrightarrow \mathrm{Mn}^{2+}

In neutral medium

\mathrm{MnO}_{4}^{-}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Mn}^{4+}

In basic medium

\mathrm{MnO}_{4}^{-}+\mathrm{e} \longrightarrow \mathrm{Mn}^{6+}

So, according to

\mathrm{pH}

, the reaction and potential of cell changes.

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