A) $ SO_4^{2-} $
B) $ {S^{2-}} $
C) $ NO_3^{-} $
D) $ CH_3CO{O^{-}} $
Correct Answer: B
$ 2KMnO_4+3H_2SO_4+5H_2S\to K_2SO_4+2MnSO_4 $
$ +8H_2O+5S $
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