The thermal stability of the hydrides of grou | vedclass

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Question

(A) The thermal stability of hydrides depends on the bond dissociation enthalpy. As we move down the group-$16$ from $O$ to $Te$,the atomic size of th

Vedclass · Accepted Answer

$H_2Te < H_2Se < H_2S < H_2O$

Vedclass · Answer

(A) The thermal stability of hydrides depends on the bond dissociation enthalpy. As we move down the group-$16$ from $O$ to $Te$,the atomic size of the central atom increases. This leads to an increase in the bond length of the $E-H$ bond (where $E = O, S, Se, Te$). As the bond length increases,the bond dissociation enthalpy decreases,making the bond weaker. Therefore,the thermal stability decreases down the group. The correct order of thermal stability is $H_2O > H_2S > H_2Se > H_2Te$ or $H_2Te < H_2Se < H_2S < H_2O$.

The thermal stability of the hydrides of group-$16$ elements follows the order:

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