Which of the following salts will undergo hydrolysis to form an acidic solution (pH < 7)?

NaCl
CH₃COONa
NH₄Cl
K₂SO₄

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NH₄Cl is a salt of a strong acid (HCl) and a weak base (NH₃). The ammonium ion (NH₄⁺) reacts with water to release H⁺ ions, making the solution acidic.

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