What is the percentage strength $(% w / V)$ of $11.2 V$ $H_{2} O_{2}$ ?

1.7

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3.4

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None of these

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Solution

The correct option is B 3.4
Strength in percentage means how many $g H_{2} O_{2}$ present per $100 m L$ .
$∵ M \Rightarrow 1$ and mol.wt.of $H_{2} O_{2} = 34$
$∴ 34 g H_{2} O_{2}$ present per litre of solution or $3.4 g H_{2} O_{2}$ present per $100 m L$ of solution.

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