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Why is there a large difference between the melting and boiling points of oxygen and sulphur? |
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Answer» Oxygen exists as diatomic molecule (O2) whereas sulphur exists as polyatomic molecule (S8). The van der Waals forces of attraction between O2 molecules are relatively weak owing to their much smaller size. The large van der Waals attractive forces in the S8 molecules are due to large molecular size. Therefore oxygen has low m.p. and b.p. as compared to sulphur. |
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