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Molarity

20 volume of ...

Question

$20$ volume of $H_{2} O_{2}$ means:

20

% of

H_{2} O_{2}

solution

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20 m L

of solution contain

1 g

H_{2} O_{2}

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1 m L

of solution liberate

20 m L

O_{2}

at STP

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20 m L

of solution contain

1

mol of

H_{2} O_{2}

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Solution

The correct option is C $1 m L$ of solution liberate $20 m L$ of $O_{2}$ at STP
Volume strength of $H_{2} O_{2}$ represents the volume of oxygen obtained at STP by the decomposition of 1 ml of that $H_{2} O_{2}$ .
If the volume strength of $H_{2} O_{2}$ is $V$ , then $1 m L$ of solution liberate $V m L$ of $O_{2}$ at STP
$20$ volume of $H_{2} O_{2}$ means $1 m L$ of solution liberate $20 m L$ of $O_{2}$ at STP.

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