Multiple choice

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

  1. H2Po > H2Te > H2Se > H2S > H2O

  2. H2Po > H2Se > H2S > H2Te > H2O

  3. H2S > H2O > H2Te > H2Se > H2Po

  4. H2O > H2S > H2Se > H2Te > H2Po

  5. H2O > H2Se > H2S > H2Po > H2Te

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Due to decrease in bond dissociation enthalpy (H−E) of hydrides on moving down the group, the order of thermal stability is H2O > H2S > H2Se > H2Te > H2Po.

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