A salt is dissolved in water. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. The salt is most likely to be
(a) Na₂CO₃(b) KCl
(c) NH₄Cl
(d) CH₃COONa

Correct Answer: (b) KCl

Explanation: Salts that are completely ionisable in water are said to be neutral salts and their pH is equal to 7. Among the given salts, only KCl is completely ionisable in the following manner: KCl (aq) → K+ + Cl

Hence, the pH of KCl will be 7.