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B
molecular substances in liquid state only
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C
molecular substances in solid state only
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D
molecular substances in any state
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Solution
The correct option is A molecular substances in gaseous state only Van der Waals radius is measured in the nonbonding state. It can't be measured in the liquid and solid-state as the atoms are bonded to each other in such state.
Therefore Van der Waals radius is measured only in the gaseous state.