An aqueous solution ' $A$ ' turns phenolphthalein solution pink. On addition of an aqueous solution

Question

An aqueous solution ' $A$ ' turns phenolphthalein solution pink. On addition of an aqueous solution ' $B$ ' to ' $A$ ' the pink colour disappears. The following statement is true for solution ' $A$ ' and ' $B$ ' :\

Professor PC Thomas Classes · Answer

(c):As the aqueous solution of $A$ turns phenolphthalein solution pink, hence $A$ is basic in nature. On adding an acidic solution, the pink colour will disappear. Hence, $B$ is an acid.