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(C) The van der Waals constant '$a$' represents the magnitude of intermolecular forces of attraction in a gas.As the intermolecular forces of attracti

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$NH_3$

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(C) The van der Waals constant '$a$' represents the magnitude of intermolecular forces of attraction in a gas.As the intermolecular forces of attraction increase,the value of '$a$' increases.Among the given options,$NH_3$ is a polar molecule capable of forming hydrogen bonds,which results in significantly stronger intermolecular forces compared to the non-polar gases $H_2$,$Ne$,and $He$.Therefore,$NH_3$ has the highest value of '$a$'.

In the van der Waals equation,which of the following will have the highest value of '$a$'?

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