Which of the following will show common ion effect and form a buffer solution?

Options

A. `CH_(3)COONH_(4)` and `CH_(3)COOH`
B. `NH_(4)Cl + NH_(4)OH`
C. `H_(2)SO_(4) + Na_(2)SO_(4)`
D. `NaCl + NaOH`

Answer

A, B

Explanation

(a) is buffer because it contains weak acid and its salt and they will also show common ion effect.
(b) Is also a buffer because it contains a weak acid and its salt. They will show common ion effect.
(c) Is not buffer solution because they contains strong acids and its salt. They will not show common ion effect
(d) Is not a buffer solution because it contains strong base and its salt. They will not show common ion effect.