Acidified potassium permanganate soultion is decoloursied by

Options

A. bleaching powder
B. white vitriol
C. Mohr's salt
D. microcosmic salt

Answer

C

Explanation

Mohr’s salt is `[FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)0]`
`underset("purple")(2KMnSO_(4)) + 8H_(2)SO_(4) +10FeSO_(4) to K_(2)SO_(4) + underset("colourless")(2MnSO_(4)) + 5Fe_(2)(SO_(4))_(3) + 8H`
Hence, Mohr.s salt decolourises `KMnO_(4)` by reducing `Mn^(7+)` ion to `Mn^(2+)` ions.