Volume of 0.02 M MnO4− solution required to oxidise 40.0 mL of 0.1 M Fe2+ solution is :
A
200 mL
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B
100 mL
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C
40 mL
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D
20 mL
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Solution
The correct option is C 40 mL MnO4−+5Fe2+→5Fe3++Mn2+ M1V1(MnO4−)=5M1V1(MnO4−) milliequivalents M2V2(Fe2+)=M2V2(Fe2+) milliequivalents N1V1(MnO4−)=N2V2(Fe2+) 5×0.02×V1=40×0.1 V1=40 mL.