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Which of the following molecules have the highest mean speed at the same temperature

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${CO}_{2}$

${SO}_{2}$

${ClO}_{2}$

${NO}_{2}$

answer is A.

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Detailed Solution

Average velocity is inversely proportional to molecular mass of the gas.

Molecular mass of ${CO}_{2} = 44 g$

Molecular mass of ${SO}_{2} = 64 g$

Molecular mass of ${ClO}_{2} = 67.5 g$

Molecular mass of ${NO}_{2} = 46 g$

Among the above all compounds, ${CO}_{2}$ has low molecular mass hence it has high mean speed.

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