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  4. One litre of a gas at S.T.P. weighs 1.16 g. It can possibly be

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Q. One litre of a gas at S.T.P. weighs 1.16 g. It can possibly be

States of Matter

Solution:

At STP,
$\frac{ V \text { olume of a gas }}{22.4}=\frac{\text { W eight }}{\text { Molecular weight }}$
$
\frac{1}{22.4}=\frac{1.16}{\text { Molecular weight }}
$
Molecular weight $=1.16 \times 22.4$
$=26 gram / mole$
Therefore, the answer is $C _{2} H _{2}$.