Among the hydrides of group `16`, water shows unusual physical properties. Why ?

Explanation

Due to high electronegativity of `O`, the `O-H` in `H_(2)O` forms strong intermolecular `H`-bonds.As a result water exists as an associated molecule while other hybrides of group `16` do not form `H`-Bonds and hence exist as discreate molecules. As a result, water shows unusual physical properties, i.e. high `b.p.` high thermal stability and weaker acidic character as compared to other hybrides of group `16`.