MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

KNO _3 is a salt of a strong acid ( HNO _3) and a strong base ( KOH ). Its aqueous solution does not undergo hydrolysis and remains neutral with pH = 7. Na _2 CO _3 is a salt of a weak acid ( H _2 CO _3) and a strong base ( NaOH ). It undergoes anionic hydrolysis, making the solution basic with pH > 7. CH _3 COONH _4 is a salt of a weak acid ( CH _3 COOH ) and a weak base ( NH _4 OH ). Since K_a K_b, its aqueous solution is almost neutral with pH 7. CuCl _2 is a salt of a strong acid ( HCl ) and a weak base ( Cu(OH) _2). The Cu ^ 2+ ion undergoes cationic hydrolysis to produce H ^+ ions, making the solution acidic with pH < 7.