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Question

MnO4 ions are reduced in acidic condition to Mn2+ ions whereas they are reduced in neutral condition to MnO2+.The oxidation of 25 ml of a solution X containing Fe2+ ions required in acidic condition 20 ml of solution Y containing MnO4 ions. What volume of solution Y would be required to oxidize 25 ml of solution X containing Fe2+ ions in neutral condition?

A
11.4 ml
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B
12.0 ml
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C
33.3 ml
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D
35.0 ml
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E
25.0 ml
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Solution

The correct option is A 11.4 ml
Acidic Fe2++MnO4Mn2++Fe3+
M1V1n1=M2V2n2
M1(25)1=M2(20)5
M1M2=425
In neutral n factor - 2
M1(25)1=M2(V)3V=33.33ml

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