Question

What is the order of thermal stability of hydrides of group 16 elements?

Answer 1

The thermal stability of the hydrides of Group 16 elements descends on moving down the group, i.e., H2O > H2S > H2Se > H2Te > H2Po.
This is due to a decrease in the bond dissociation enthalpy (H-E) of hydrides on moving down the group.

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