MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Na _2 CO _3 is a salt of a strong base ( NaOH ) and a weak acid ( H _2 CO _3), so its aqueous solution is basic with pH > 7. CuCl _2 is a salt of a weak base ( Cu(OH) _2) and a strong acid ( HCl ), so its aqueous solution undergoes cationic hydrolysis to give an acidic solution with pH CH _3 COONa is a salt of a strong base ( NaOH ) and a weak acid ( CH _3 COOH ), so its aqueous solution is basic with pH > 7. NaNO _3 is a salt of a strong base ( NaOH ) and a strong acid ( HNO _3), so its aqueous solution is neutral with pH = 7. Therefore, CuCl _2 has the least pH value. Answer: CuCl _2