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Question

10 dm3 of N2 gas and 10 dm3 of a gas X at the same temperature contain the same number of molecules and have the same mass. The gas X is:

A
CO2
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B
CO
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C
H2
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D
NO
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Solution

The correct option is B CO
It is given that the gases are at the same temperature and volume conditions and contain the same number of molecules.

We know that, molecular weight of N2=28 g.
moles of N2=moles of X (they have same number of molecules).
This is only possible when they have the same molecular weight.
Molecular weight of CO=28 g.

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