Question

Assertion: A solution of $N{H_4}Cl$ in water is acidic in nature.
Reason: Ammonium ions undergo hydrolysis to form $N{H_4}OH$ .
(A) If both the assertion and reason are true and reason is the correct explanation of assertion.
(B) If both the assertion and reason are true but reason is not the correct explanation of assertion.
(C) If the assertion is true but the reason is false.
(D) If both assertion and reason are false.

Answer 1

An acid is a chemical compound or substance which when dissolved in water gives positive hydrogen ions that make the solution acidic. Some of the acids react with metal to give salts. Ammonium chloride is a salt and the positive ammonium ions react with water to form hydroxide.

Complete Step by step solution
Ammonium hydroxide solution of ammonia in water, is a colourless, white liquid with a pungent scent of ammonia. It has a hydroxide group that is an OH group within it. The OH group indicates that the compound is basic in nature.
When ammonium chloride is dissolved in water it releases positive ammonium ions and negative chlorine ions. The positive ammonium ion reacts with water which means that the positive ammonium ion undergoes hydrolysis to give ammonium hydroxide and positive hydrogen ions. Slowly and steadily, there is an increase in the number of positive hydrogen ions which in turn makes the solution acidic.
Therefore, both assertion and reason are true and reason is the correct explanation of assertion.
Hence the correct answer is option A.

Note
The solution of ammonium chloride in water is a very weak acid.
The uses of ammonium chloride are as follows,
-It is used in fertilizers as a nitrogen source.
-It is used in medicine as an expectorant.
-It is used in food additives.
-It is used as an acidifier.