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Question

# What is the volume (in ml) of 0.1 M potassium permanganate solution required to completely oxidise 100 ml of 0.5 M ferrous sulphate solution in acidic medium?

A
20
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B
200
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C
50
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D
100
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Solution

## The correct option is B 100Given parameters are:M1=0.1MM2=0.5MV1=?V2=100mlBalanced equation is:10FeSO4+2KMnO4+8H2SO4=5Fe2SO4+2MnSO4+K2SO4+8H2OThus no. of moles of KMnO4 , n1 is 2and of FeSO4 , n2 is 10.Thus formula based on the concept of stoichiometry.n2×M1×V1=n1×M2×V210×0.1×V1=2×0.5×100V1=100mlTherefore volume will be 100 ml. Thus, Option D is correct.

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