50ml $H_{2} O_{2}$ is completely oxidized by 10 ml, 0.2 N KMnO₄ solution in acidic medium. Incorrect value for the strength of hydrogen peroxide is

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0.68 gm/lit

$\frac{M}{50}$

$\frac{N}{25}$

$33.4 % (w / v)$

answer is D.

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Detailed Solution

Eq. $H_{2} O_{2} =$ eq. $K M n O_{4}$

$\begin{array}{l} 50 \times N = 10 \times 0.2 \\ N = \frac{0.2}{5} = \frac{1}{25}; M = \frac{N}{2} = \frac{1}{50} \\ M = \frac{S}{M . w t .} \Rightarrow S = \frac{1}{50} \times 34 = 0.68 g / L \end{array}$

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