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Which will be adsorbed more readily on t...

Which will be adsorbed more readily on the surface of charcoal and why`-NH_(3)` or `CO_(2)`?

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The correct Answer is:
`NH_(3)` has higher critical temperature than that of `CO_(2)`, i.e. `NH_(3)` is more easily liquefiable than `CO_(2)` because, `NH_(3)` has greater intermolecular forces of attraction and hence will be adsorbed more readily.
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