1.

Explain the following observations: Oxygen is a gas but sulphur is a solid.

Answer»

Solution :Oxygen is a gas but sulphur is a solid
This is because oxygen forms a `O_2` molecule due to its small size but sulphur cannot because of BIGGER size of S. Sulphur therefore EXHIBITS CATENATION forming `S_8` molecule. `S_8` having a high MOLECULAR mass has a higher boiling and melting point. Hence, it is a solid while oxygen is a gas at room temperature.


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