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The van der Waals constant $a$ for a gas is high. This indicates that the gas

Ahas strong intermolecular attractions and is easily liquefied
Bhas weak intermolecular attractions
Chas very small molecules
Dbehaves ideally

Answer: A

A large

a

means strong attraction between molecules. Such gases (e.g.

NH X_{3}

,

SO X_{2}

) have high critical temperatures and are easily liquefied by compression.

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