1.

Thermal stability of hydrides of group 16 elements decreases in the following order

Answer»

`H_(2)PO gt H_(2)Te gt H_(2)Se gt H_(2)S gt H_(2)O`
`H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)Po`
`H_(2)S gt H_(2)Se gt H_(2)O gt H_(2)Te gt H_(2)Po`
`H_(2)S gt H_(2)Se gt H_(2)Te gt H_(2)O gt H_(2)Po`

Solution :It is because the STRENGTH of M-H bond decreased down the group, due to the INCREASES in the SIZE of central atom 'M',


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