Question

Assertion (A) : H₂S is less acidic than H₂Te.

Reason (R) : H-S bond has more Δ_bond H° than H-Te bond.

(A) Both A and R are true and R is the correct explanation of A.

(B) Both A and R are true but R is not the correct explanation of A.

(C) A is true but R is false.

(D) A is false but R is true.

Answer 1

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

H₂S is less acidic than H₂Te. acidity depends on H-S and H-Te bond dissociation energy higher the bond dissociation energy. Less will be acidity.

On moving down the group the size of the atom increases and ionization enthalpy decreases. This helps to dissociate the bond easily. That's why H₂Te is more acidic than H₂S.