If you take 4 balloons and fill one with $H_{2}$ gas, second one with $N_{2}$ gas, third one with $O_{2}$ gas and the last one with $C l_{2}$ gas. Then which balloon will rise the highest in the same time interval.

$H_{2}$

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$O_{2}$

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$C l_{2}$

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$N_{2}$

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Solution

The correct option is A
$H_{2}$

The density of $H_{2}$ is the lowest amongst all other gases. So $H_{2}$ is the lightest gas, even lighter than air. So the balloon filled with $H_{2}$ will rise the highest.

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