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Q.

In the redox ionic equation, 2MnO4– + Br– + H2O → 2MnO2 + BrO3– + 2OH–; the equivalent weight of potassium permangante of molar mass ‘M’ in g mol–1 is

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a

M/5

b

M/6

c

M/3

d

M/2

answer is B.

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Detailed Solution

2Mn+7O4-+ Br-1 + H2O → 2Mn+4O2 +BrO3- + 2OH–

Change in oxidation state in Br from reactant to product is +3. Hence, the equivalent weight of Br is M/3.

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