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STD 12 - 4. d and f- block elements — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. d and f- block elements4 Marks
MCQ
Acidified potassium permanganate solution is decolourised by
  • A
    Bleaching powder
  • B
    White vitriol
  • ✓
    Mohr's salt
  • D
    Microcosmic salt
✓

Answer

Correct option: C.
Mohr's salt
c
(c)Mohr’s salt.

$2KMn{O_4} + 8{H_2}S{O_4} + 10FeS{O_4}\, \to $

${K_2}S{O_4} + 2MnS{O_4} + 5F{e_2}{(S{O_4})_3} + 8{H_2}O$

Mohr’s salt decolourises $KMn{O_4}$ by reducing $M{n^{ + 7}}$ ions to $M{n^{ + 2}}$ ions.

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