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The equivalent mass of KMnO4in the follo...

The equivalent mass of `KMnO_4`in the following reaction is ________________.
(M = Molecular mass)
`MnO_4^- +5Fe^(2+) + 8H^+ to Mn^(2+) + 5 Fe^(3+) + 4H_2 O`

A

`M/2`

B

`M/3`

C

`M/4`

D

`M/5`

Text Solution

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The correct Answer is:
D
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What will be the spontaneous reaction when the following half reactions are combined ? (i) Fe^(3+) + e^(-) to Fe^(2+) , (ii) MnO_(4)^(-) + 8 H^(+) + 5 e^(-) to Mn^(2+) + 4 H_(2) O , (E^(Theta) = + 1.49 V ) What is the value of E_(cell)^(Theta) ?

STATEMENT-1: The equivalent mass of of KMnO_(4) in acidic medium is (M)/(5) where M=molecular mass of KMnO_(4) STATEMENT-2: Equivalent mass is equal to product of molecular mass and change in oxidation number.

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