Which of the following gases is the densest?

Nitrogen

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Chlorine

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Oxygen

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Methane

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Solution

The correct option is C Chlorine
Density is Mass per volume.
At STP , 1mole of any gas occupies same volume $22.4 L$ .
Therefore the density depends only on mass.
for 1 mole, mass of gas is its molecular mass.
Density= molecular mass
MW of $N_{2} = 28$
MW of $C l_{2} = 70$
MW of $O_{2} = 32$
MW of $C H_{4} = 16$
Therefore $C l_{2}$ has maximum molecular mass and hence it is densest among given gases.

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