Question

Acidified ${MnO}_4^{-}$ can be decolourised by :

• A. ${CaC}_2{O}_4$
• B. $H_2{O}_2$
• C. ${FeSO}_4$
• D. All of these

Answer 1

The correct option is D All of these

Acidified ${MnO}_4^{-}$ can be decolourised by ${CaC}_2{O}_4$, $H_2{O}_2$ and ${FeSO}_4$

$2Mn{O}_4^{-}+5H_2{O}_2+6H^{+}⟶2M{n}^{2+}+8H_{2}O+5O_2$

$2Mn{O}_4^{-}+5C_2{O}_4^{2-}+16H^{+}\to 2M{n}^{2+}+10C{O}_2+8H_{2}O$

$Mn{O}_4^{-}+5F{e}^{2+}+8H^{+}\to 5F{e}^{3+}+M{n}^{2+}+4H_{2}O$

Option D is correct.