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(B) Oxygen exists as a diatomic molecule,$O_2$ (Atomicity $= 2$),which is held by weak van der Waals forces. Sulphur exists as a polyatomic molecule,$

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Atomicity

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(B) Oxygen exists as a diatomic molecule,$O_2$ (Atomicity $= 2$),which is held by weak van der Waals forces. Sulphur exists as a polyatomic molecule,$S_8$ (Atomicity $= 8$),which has a much larger molecular mass and stronger van der Waals forces. Therefore,the melting and boiling points of sulphur are significantly higher than those of oxygen due to the difference in their atomicity.

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

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