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Why is `H_2O` a liquid and `H_2S` a gas? |
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Answer» O is more electronegative than S, hence `H_2O` undergoes extensive intermolecular hydrogen bonding. Hence `H_2O` exists as an associated molecule in which each O is tetrahedrally surrounded by four H atoms. Therefore. `H_2O` exists as a liquid at room temperature. On the orhter hand, `H_2S` does not exhibit hydrogen bonding `H_2S` exists as discrete molecules, which are held together by weak van der waals forces of attraction. Hence, `H_2S` is a gas. |
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