. Which one of the following pairs of solutions is not an acidic buffer
(a) CH3COOH and CH3COONa
(b) H2CO3 and Na2CO3
(c) IH3PO4 and Na3PO4
(d) HClO4 and NaClO4
Correct Option is (a)
(dHClO4 is the strongest acid amongst H2CO3,H3PO4,HClO4 and CH3COOH
and for acidic buffer the mixture should contain weak acid and its conjugate base.