1.

The increasing order of volatitility of hydrides of group 16 element is

Answer»

`H_(2)S LT H_(2)O lt H_(2)SE lt H_(2)Te`
`H_(2)O lt H_(2)Te lt H_(2)Se lt H_(2)S`
`H_(2)O, H_(2)S lt H_(2)Se lt H_(2)Te`
`H_(2)Te lt H_(2)Se lt H_(2)S lt H_(2)O`

Solution :As `H_(2)O` has the HIGHEST boiling point and `H_(2)S` the LOWEST, and boiling point further increases from `H_(2)Se` to `H_(2)TE`, therefore the volatility increases in the order `H_(2)O lt H_(2)Te lt H_(2)Se lt H_(2)S`


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