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Q.

100ml of KMnO4 solution is exactly reduced by 100ml of 0.5M oxalic acid under acidic condition. The molarity of KMnO4 solution is

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a

0.1M

b

0.2M

c

0.05M

d

0.5M

answer is B.

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Detailed Solution

n-factor for KMnO4/H+ (n1)  =  5 (MnO4- → Mn+2)n-factor for H2C2O4 (n2)  =  2 (C2O4-2 → 2CO2) KMnO4 = H2C2O4 V1N1 = V2N2100(M1)5 = 100(0.5)2M1 = 0.2
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100ml of KMnO4 solution is exactly reduced by 100ml of 0.5M oxalic acid under acidic condition. The molarity of KMnO4 solution is