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Assertion Assertion: A solution of \( N H_{4} C l \) in water is acidic in nature. Reason Reason : Ammoniun ions undergo hydrolysis to form \( N H_{4} O H \)

1. If both the assertion and reason are true and reason is the correct explanation of assertion.
2. If both the assertion and reason are true but reason is not the correct explanation of assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false

Correct answer: If both the assertion and reason are true and reason is the correct explanation of assertion.

Solution

NH4Cl is a salt of a weak base (NH3) and a strong acid (HCl), so its solution is acidic because NH4+ hydrolyzes in water to release H3O+. The reason is essentially true and explains the acidity, since ammonium ion hydrolysis is what makes the solution acidic.

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