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Q.

25 ml of Ferrous sulphate solution reduces 75 ml of 0.04 M potassium permanganate solution in acidic medium. Molarity of Ferrous sulphate solution is

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a

0.24 M

b

0.6 M

c

0.12 M

d

0.3 M

answer is B.

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Detailed Solution

Fe+2→Fe+3; +2       +3 Increase in ox.state/mole=1valency; MnO4-→Mn+2  +7          +2 Decrease in ox.state/mole=5valency; V1N1FeSO4=V2N2KMnO4;      25×M1×1=75×0.04×5;                    M1=0.6 M
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