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The thermal stability of hydrides of oxy...

The thermal stability of hydrides of oxygen family is in order :

A

`H_2 Po lt H_2 Te lt H_2 Se lt H_2 S lt H_2 O`

B

`H_2 Po lt H_2 O lt H_2 Te lt H_2 Se lt H_2 S `

C

` H_2 S lt H_2 O lt H_2 Te lt H_2 Se lt H_2 Po`

D

` H_2 O H_2 lt H_2 Te lt H_2 Se lt H_2 Po`

Text Solution

Verified by Experts

The correct Answer is:
A
The thermal stability of the hydrides decreases with increase in molecular mass. While, water dissociates only at `2000^@ C`, `H_2 S` dissociates above `280^@ C, H_2` Te decomposes even at ordinary temperature. The thermal stability order is
` H_ 2O gt H_2 S gt H_2 Se gt H_2 Te gt H_2 PO`
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BRILLIANT PUBLICATION-P-BLOCK ELEMENTS-LEVEL-II
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