Question
Why is $H_2O$ a liquid and $H_2S$ a gas?
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Answer
$H_2O$ has oxygen as the central atom. Oxygen has smaller size and higher electronegativity as compared to sulphur. Therefore, there is extensive hydrogen bonding in $H_2O$, which is absent in $H_2S$. Molecules of $H_2S$ are held together only by weak van der Waal’s forces of attraction.
Hence, $H_2O$ exists as a liquid while $H_2S$ as a gas.
Hence, $H_2O$ exists as a liquid while $H_2S$ as a gas.
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