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Hydrides of Nitrogen

What volume s...

Question

What volume strength of 100 mL $H_{2} O_{2}$ is required for the complete reaction with 15.8 g of $K M n O_{4}$ in basic medium? (Molar mass of $K M n O_{4}$ is 158 g/mol).

5.6

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11.2

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1.86

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3.73

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Solution

The correct option is A 5.6
15.8 g of $K M n O_{4}$ = $0.1 m o l K M n O_{4}$
Since n-factor of $K M n O_{4}$ in basic medium is 1, thus
$0.1 m o l K M n O_{4} = 0.1 e q v . o f K M n O_{4}$
Therefore, $H_{2} O_{2}$ required is 0.1 eqv.
So, volume strength $= 5.6 \times N$
$\Rightarrow 5.6 \times \frac{0.1}{100} \times 1000 = 5.6$

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