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Why is H(2)O a liquid and H(2)S a gas?...

Why is `H_(2)O` a liquid and `H_(2)S` a gas?

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The difference in electronegativity values of O(3.5) and H(2.1) and S(2.5) i.e., `O-H` bond is more polar than `S-H` bond. That is why H - bonding is present among water molecules but absent in `H_(2)S`. Thus, strong intermolecular interactions cause water to exist as a liquid but due to weak Van der Waals forces `H_(2)S` exists as a gas.
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