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Q.

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

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a

100

b

200 

c

50 

d

 20 

answer is D.

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Detailed Solution

M1​=0.1M

M2​=0.5M

V1​=?

V2​=100ml

Balanced eq is

10FeSO4​+2KMnO4​+8H2​SO4​=5Fe2​SO4​+2MnSO4​+K2​SO4​+8H2​O

Formula follows

n2​×M1​×V1​=n1​×M2​×V2​

10×0.1×V1​=2×0.5×100

V1​=100ml

Hence the correct answer is (D)100

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