1.

The thermal stability of the hybrides of oxygen family is in order :A. `H_2Po lt H_2Telt H_2Se lt H_2SltH_2O`B. `H_2Polt H_2O lt H_2Te lt H_2Se lt H_2S`C. `H_2S lt H_2O lt H_2Te lt H_2Se lt H_2Po`D. `H_2O lt H_2S lt H_2Te lt H_2Te lt H_2Se lt H_2Po`

Answer» Correct Answer - A
Down the group (H-E) bond dissociation enthalpy decreases as (H-E) bond length increase because of increases in size of cation. Thus thermal stability of hybrides also decreases.


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