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NaCl is a salt of strong acid and strong base hence its aqueous solution will be neutral i.e. pH = 7. NaHCO3 is an acidic salt hence pH < 7. Na2CO3 is a salt of weak acid and strong base hence its aqueous solution will be strongly basic i.e. pH > 7. NH4Cl is salt of weak base and strong acid, hence its aqueous solution will be strongly acidic i.e. pH < 7.

1. NaCl is a salt of strong acid and strong base hence its aqueous solution will be neutral i.e. pH = 7.
2. NaHCO3 is an acidic salt hence pH < 7.
3. Na2CO3 is a salt of weak acid and strong base hence its aqueous solution will be strongly basic i.e. pH > 7.
4. NH4Cl is salt of weak base and strong acid, hence its aqueous solution will be strongly acidic i.e. pH < 7.

Correct answer: NaCl is a salt of strong acid and strong base hence its aqueous solution will be neutral i.e. pH = 7.

Solution

Option A is correct because NaCl is formed from a strong acid (HCl) and a strong base (NaOH), resulting in a neutral solution with pH = 7. The other statements contain errors in describing the pH behavior of the salts.

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