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In acidic medium KMnO4 (Molecular weight...

In acidic medium `KMnO_4` (Molecular weight = 158.04) reacts with ferrous ammonium sulphate`[FeSO_4 (NH_4)_2 SO_4 . 6H_2O]` (Molecular weight = 392.14) as follows `2KMnO_4 + 8H_2SO_4 + 10FeSO_4 → K_2SO_4+ 2MnSO_4 + 5Fe_2(SO_4)_3 + 8H_2O`
The equivalent weight of `KMnO_4` is

A

22.58

B

31.61

C

52.68

D

158.04

Text Solution

Verified by Experts

The correct Answer is:
B
`overset(+7)(2K) MnO_4 + 8H_2SO_4 + 10 FeSO_4 to K_2SO_4 + overset(+2)(2MnSO_4) + 5Fe_2(SO_4)_3 + 8 H_2O`
Change in oxidation stat fo `Mn = (7) - (+2) = 5` units
`:.` Equivalent weight of `KMnO_4` is acidic medium
` = 158.04/5 = 31.61`
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