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Q.

Calculate the mass of anhydrous oxalic acid, which can be oxidised to CO2(g) by 100 mL of an MnO4− solution, 10mL of which is capable of oxidising 50 mI of 1N oxalic acid. 

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a

45 g

b

22.5 g

c

30 g

d

12.25 g

answer is B.

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Detailed Solution

Let normality of KMnO4 solution is N
∴N×10=50×1 ⇒ N=5
m-eq, of MnO4− = m-eq. of oxalic acid
=N1V1=WE×1000
5×100=W(90/2)×1000⇒W=22.5g

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