Water has a higher boiling point than the corresponding hydrides H2S, H2Se and H2Te. This is because water has

B·Pt∝1 Volatility B.Pt order : H2S < H2Se < H2Te < H2OBoiling point order From →H2 S to H2Te  As the size of central atom increases,Size of molecule [or MWT] increases, and hence intermolecular attractions between the molecules increases.∴ Inorder to break up  those attractions we need to provide more amount of energy in the form of boiling point [heat].H2O possess exceptionally hight boiling point among all the VIA group hybrides, due to its ability to form intermolecular hydrogen bonding∴The volatility order is→H2S¯>H2Se>H2Te>H2OAs the boiling point increases, volatility decreases.Note :- Volatility is the property of a compound, indicates how  easily a compound  undergoes vapourisation.