Question 33

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: $$H_2Te$$ is more acidic than $$H_2S$$.
Reason R: Bond dissociation enthalpy of $$H_2Te$$ is lower than $$H_2S$$.
In the light of the above statements, choose the most appropriate from the options given below.

Assertion A: H$$_2$$Te is more acidic than H$$_2$$S — TRUE. Acidic strength increases down the group.

Reason R: Bond dissociation enthalpy of H-Te bond is lower than H-S bond — TRUE. The larger size of Te makes the bond weaker.

R correctly explains A: because the lower bond dissociation enthalpy means easier release of H$$^+$$, making H$$_2$$Te more acidic.

The answer is Option (2): Both A and R are true and R is the correct explanation of A.

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