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Q.

Calculate the mass of anhydrous oxalic acid, which can be oxidised to CO₂(g) by 100 mL of an ${MnO}_{4}^{-}$ 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
$∴ N \times 10 = 50 \times 1 \Rightarrow N = 5$
m-eq, of ${MnO}_{4}^{-}$ = m-eq. of oxalic acid
$= N_{1} V_{1} = \frac{W}{E} \times 1000$
$5 \times 100 = \frac{W}{(90 / 2)} \times 1000 \Rightarrow W = 22 .5 g$

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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.