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In presence of acidic medium, $\mathrm{KMnO}_4$ converts $\mathrm{H}_2 \mathrm{~S}$ into
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S only.
Acidified $\mathrm{KMnO}_4$ oxidises $\mathrm{H}_2 \mathrm{~S}$ to $\mathrm{S}$ only.
$2 \mathrm{KMnO}_4+3 \mathrm{H}_2 \mathrm{SO}_4+5 \mathrm{H}_2 \mathrm{~S} \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+2 \mathrm{MnSO}_4+5 \mathrm{~S}+8 \mathrm{H}_2 \mathrm{O}$
$2 \mathrm{KMnO}_4+3 \mathrm{H}_2 \mathrm{SO}_4+5 \mathrm{H}_2 \mathrm{~S} \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+2 \mathrm{MnSO}_4+5 \mathrm{~S}+8 \mathrm{H}_2 \mathrm{O}$
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