Among hydrides of elements of group 16 why water shows unusual physical properties
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The oxygen has high electronegativity.
Hence the O-H bond in H2O forms strong inter molecular hydrogen bonds.
As a result, water exist as an associated molecule.
But the other hydrides of group 16 do not form hydrogen bonds.
Therefore they exist as discrete molecules.
Thus, water shows unusual physical properties such as high thermal stability, high b.p., weaker acidic character as compared to the other hydrides of group 16.
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