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Q. $MnO _{3}^{-}+ S ^{2-}+ H ^{+} \longrightarrow Mn ^{2+}+ S + H _{2} O .$ When this equation is balanced, the total number of coefficients on the left hand side are

The d-and f-Block Elements

Solution:

$2 MnO _{4}^{-}+16 H ^{+}+5 S ^{2-} \longrightarrow 2 Mn ^{2+}+8 H _{2} O +5 S$