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Question

Arrange the following: H2S,H2O,H2Se&H2Te in order of increasing acidity


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Solution

The acidity of hydrides:

  • The acidity of given hydrides of the oxygen family will be H2O<H2S<H2Se<H2Te.

Reason:

  • The acidity of hydrides depends on the bond dissociation enthalpy.
  • The Bond Dissociation Enthalpy is the measurement of the amount of energy needed during an endothermic reaction to break down a chemical bond and separate it into two distinct atoms, each of which retains one of the first mutual pair's electrons.
  • The acidity of given hydrides of the oxygen family increases down the group with a decrease in the bond dissociation enthalpy.
  • Thus, the correct order of acidity will be H2O<H2S<H2Se<H2Te.


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