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(C) The van der Waals constant $a$ represents the magnitude of intermolecular attractive forces between gas molecules. Greater the value of $a$,strong

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$NH_3$

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(C) The van der Waals constant $a$ represents the magnitude of intermolecular attractive forces between gas molecules. Greater the value of $a$,stronger are the intermolecular forces of attraction. Stronger intermolecular forces facilitate easier liquefaction of the gas. Comparing the given values: $a(NH_3) = 4.170 > a(CH_4) = 2.253 > a(N_2) = 1.390 > a(O_2) = 1.360$. Therefore,$NH_3$ has the highest value of $a$ and can be liquefied most easily.

The values of the van der Waals constant $a$ for gases $O_2, N_2, NH_3$,and $CH_4$ are $1.360, 1.390, 4.170$,and $2.253 \ L^2 \ atm \ mol^{-2}$ respectively. Which gas can be liquefied most easily?

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