The vapor density of gas is 22. It cannot be:

Carbon dioxide

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Nitrous oxide

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Propane

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Methane

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Solution

The correct option is A Methane
Molecular weight $= 2 \times v a p o r d e n s i t y$

$= 2 \times 22 = 44$ .

Molecular weight of CH $_{4}$ $= 16$ .

Therefore, it cannot be methane. Nitrous oxide, propane and carbon dioxide have molecular weight = $44$ .

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