Question

give reason why H2O is a liquid while H2S is a gas at room temperature?

Answer 1

water exists as a liquid at room temperature with a high boiling point. Sulphur is less electronegative than oxygen, and the S-H bond is much less polar than the O-H bond. Hence, there is no hydrogen bonding in hydrogen sulphide, and it normally exists as agas with discrete H2S molecules.

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