Question
Why is water liquid whereas $\mathrm{H}_2 \mathrm{S}$ is gas at room temperature?

Answer

$\mathrm{H}_2 \mathrm{O}$ molecules are associated with intermolecular H -bonding whereas $\mathrm{H}_2 \mathrm{S}$ is not because ' O ' is more electronegative and smaller in size than ' 5 '.

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