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Question

Which of the following pairs of gases will have identical of effusion under similar conditions?

A
Diprotium and dideutrium
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B
Carbon dioxide and ethane
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C
Dideuterium and helium
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D
Ethene and ethane
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Solution

The correct option is C Dideuterium and helium
According to graham's law of diffusion,
The role of diffusion/effusion of a gas is inversely proportional to the square root of the molecular mass of the gass under observation. Here, the dideutreium and Helium have some mass, which is 4 amu. So, their rates are same.

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