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Question

5.6 litres of a gas weighs 1 g at STP. The gas can be:

A
H2
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B
N2
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C
He
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D
O2
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Solution

The correct option is C He
Number of moles of gas 5.622.4=14

Number of moles=WeightMolecular weight

=14=1Molecular weightMolecular weight=4

Molecular weight 4 is possible only for He out of the given options. Hence, the answer is (c)

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