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\( \mathrm{KMnO}_{4} \) can be prepared from \( \mathrm{K}_{2} \mathrm{MnO}_{4} \) as per the reaction,
\[
3 \mathrm{MnO}_{4}^{2-}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{MnO}_{4}+\mathrm{MnO}_{2}+4 \mathrm{OH}^{-}
\]
\( P \)
The reaction can go completion by removing \( \mathrm{OH}^{-} \)ions by adding :
(NEET 2013)
W
(a) \( \mathrm{HCl} \)
(b) \( \mathrm{KOH} \)
(c) \( \mathrm{CO}_{2} \)
(d) \( \mathrm{SO}_{2} \)
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