The salt which is formed of weak acid & weak base

Explanation

The correct answer is CH₃COONH₄ because it is a salt formed from the reaction between a weak acid (acetic acid) and a weak base (ammonia). This combination leads to a salt that does not completely dissociate in water, and its pH depends on the relative strengths of the acid and base. In contrast, KCl and KNO₃ are formed from strong acids and strong bases, resulting in neutral salts. CH₃COONa, while involving a weak acid (acetic acid), is paired with a strong base (sodium hydroxide), resulting in a basic salt.