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Concentration Terms

What volume o...

Question

What volume of $O_{2}$ measured at standard conditions will be formed by the action of $100$ mL of $0.5 N$ $K M n O_{4}$ on hydrogen peroxide in an acidic solution?

0.12

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0.28

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0.56

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1.12

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Solution

The correct option is B $0.56$ L
The reaction is as follows:
$2 K M n O_{4} + 5 H_{2} O_{2} + 3 H_{2} S O_{4} \to 2 M n S O_{4} + 5 O_{2} + K_{2} S O_{4} + 8 H_{2} O$
So, number of moles of $K M n O_{4} = 0.1$ (given)
So, $\frac{100 \times 0.1}{1000} = 0.01$ mol of $K M n O_{4}$ will produce $(\frac{5}{2}) \times 0.01 = 0.025$ mol of $O_{2} = 0.025 \times 22.4 = 0.56$ L.

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