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Explain why H2O is a liquid but H2S is a...

Explain why `H_2O` is a liquid but` H_2S` is a gas at room temperature.

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Oxygen is more electronegative than sulphur. Intermolecular H-bonding occurs in `H_(2)O` and not in `H_(2)S`. Large number of `H_(2)O` molecules are associated and exist as liquid. In `H_(2)S`, neighbouring molecules are not associated. Hence, it exists as gas at room temperature.
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