why water is liquid and so2 gas at room temperature
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Hydrogen bond is seen to be available only in compounds having these three elements (F, O, N ) making those compounds liquid in state.
So you may come to see that in H2S there does not exist a hydrogen bond but in H2O , the hydrogen bond does exist.
So because of hydrogen bond, the water (H2O) is a liquid and hydrogen sulphide (H2S) is not.
In the following picture you will see hydrogen bonding in water , which is absent in hydrogen sulphide gas.