1.

The correct order of increasing boiling point is

Answer»

`H_(2)S, H_(2)O, H_(2)Te, H_(2)Se`
`H_(2)O, H_(2)S, H_(2)Se, H_(2)Te`
`H_(2)Te, H_(2)Se, H_(2)S, H_(2)O`
`H_(2)S, H_(2)Se, H_(2)Te, H_(2)O`

Solution :As the size increases from S to Te, the VAN der WAALS forces of attraction interacting the molecules `H_(2)M` increase and hence the boiling point increases in that ORDER. However, water has the HIGHEST boiling point because of intermolecular H - bonding. Thus, `H_(2)S` has the lowest boiling point.


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