Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: H₂Te is more acidic than H₂S.

Reason R: Bond dissociation enthalpy of H₂Te is lower than H₂S.

In light of the above statements, choose the most appropriate from the options given below:

• A. A is true but R is false.
• B. A is false but R is true.
• C. Both A and R are true but R is NOT the correct explanation of A.
• D. Both A and R are true and R is the correct explanation of A.

Answer 1

The Correct Option is D

Assertion A: The relative acidity of hydrogen compounds like H₂S and H₂Te is determined by the stability of their conjugate bases. H₂Te exhibits higher acidity due to its larger atomic size and weaker H–Te bonds, facilitating easier ionization compared to H₂S.

Reason R: Bond dissociation enthalpy quantifies the strength of the bond between hydrogen and S or Te. Weaker H–Te bonds in H₂Te, as indicated by lower bond dissociation enthalpy, result in easier dissociation and consequently higher acidity, thus supporting Assertion A.

Both Assertion A and Reason R are true, and Reason R correctly explains Assertion A.