Question

Which one of the following is not a buffer solution?

(a) 0.8 M H₂S + 0.8 M KHS

(b) 2 M C₆H₅NH₂+ 2M C₆H₅NH₃⁺Br^-

(c) 3 M H₂CO₃ +3 M KHCO₃

(d) 0.05 M KClO₄ + 0.05 M HClO₄

Answer 1

Correct option  (d) 0.05 M KClO₄ + 0.05 M HClO₄

Explanation:

Buffer solutions can be obtained by mixing a weak acid with its salt formed with a strong base or by mixing a weak base with its salt formed with a strong acid.

As HCIO₄ is a strong acid, therefore equimolar mixture of HCIO₄ and its salt KClO₄ is not a buffer solution.