Density of a gas at STP is $2 g / L$ while the expected density is $1.8 g / L$ assuming its ideal behaviour. Then.

gas behaves ideally

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forces of attraction are dominant among gas molecules

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forces of repulsion are dominant among gas molecules

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none of the above

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Solution

The correct option is B forces of attraction are dominant among gas molecules
Density of a gas at STP is 2g/L while the expected density is 1.8 g/L assuming its ideal behavior. Then the forces of attraction are dominant among gas molecules. Since the density is higher than that expected from ideal behavior, the given mass of gas occupies less volume than that expected from ideal behavior. This suggests that molecules are pulled towards each other.

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