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A flask containing methane gas was weigh...

A flask containing methane gas was weighed at a measured temperature and pressure. The flask was emptied and then filled with oxygen at the same temperature and pressure. The weight of methane vapour will be about

A

the same as that of oxgen

B

one half as heavy as oxygen

C

one fifth as heavy as oxygen

D

five times as heavy as oxygen

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The correct Answer is:
B
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