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The four tires of a motor car are filled with 27. Strongest reducing agent $\begin{array}{l} {CO}_{2}, He, H_{2} and O_{2} \end{array}$ respectively. The order in which, they are to be re-inflated is

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$\begin{matrix} {CO}_{2}, O_{2}, He, H_{2} \end{matrix}$

$H_{2}, O_{2}, He, {CO}_{2}$

$H_{2}, He, {CO}_{2}, O_{2}$

$\begin{matrix} H_{2}, He, O_{2}, {CO}_{2} \end{matrix}$

answer is B.

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Detailed Solution

Rate of diffusion of gas is inversely proportional to its molecular mass. Hence, higher the molecular mass, less it has to be re-inflated and vice versa.

Thus, the order in which they effuse is $H_{2} > He > O_{2} > {CO}_{2}$

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