1.

`H_(2)O` is liquid while `H_(2)S` is a gas at room temperature. Explain.

Answer» H-O bond is more polar than H-S bond because of greater electronegativity difference in the bonding atoms. As a result, `H_(2)O` molecules are involved in the intermolecular hydrogen bonding and get associated to be liquid at room temperature. Since intermolecular hydrogen bonding is negligible in the molecules of `H_(2)S`, they donot get associated and remain in the gaseous state at room temperature. For more details, consult text part (Section 16).


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