[CPMT 1979, 91; MP PMT 1987]
A) $ K_2SO_3 $
B) $ MnO_2 $
C) $ KHSO_3 $
D) Sulphur
Correct Answer: D
$ 2KMnO_4+3H_2SO_4+5H_2S\to $ $ K_2SO_4+2MnSO_4+8H_2O+5S $
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