1.

Correct decreasing order of volatility is

Answer»

`H_(2)O GT H_(2)S gt H_(2)SE`
`H_(2)S gt H_(2)O gt H_(2)Se`
`H_(2)Se gt H_(2)O gt H_(2)S`
`H_(2)S gt H_(2)Se gt H_(2)O`

ANSWER :D


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