Question

In the laboratory, hydrogen chloride is prepared by heating

• A. Sodium chloride and concentrated sulphuric acid
• B. Bleaching powder and concentrated sulphuric acid
• C. Potassium chlorate and concentrated sulphuric acid
• D. Bleaching powder and ammonia solution

Hint:

In the laboratory, hydrogen chloride is prepared by heating sodium chloride with concentrated sulfuric acid, producing HCl gas.

Answer 1

The Correct Option is A

Step 1: Understanding the preparation method.
In the laboratory, hydrogen chloride (HCl) is usually prepared by heating sodium chloride (NaCl) with concentrated sulphuric acid (H\(_2\)SO\(_4\)), which results in the formation of hydrogen chloride gas. The reaction is as follows: \[ \text{NaCl} + \text{H}_2\text{SO}_4 \rightarrow \text{NaHSO}_4 + \text{HCl} \] Step 2: Analyzing the options.
(A) Sodium chloride and concentrated sulphuric acid: Correct. This is the most common method to prepare hydrogen chloride in the laboratory.
(B) Bleaching powder and concentrated sulphuric acid: Incorrect. This reaction produces chlorine gas, not hydrogen chloride.
(C) Potassium chlorate and concentrated sulphuric acid: Incorrect. This reaction produces chlorine gas, not hydrogen chloride.
(D) Bleaching powder and ammonia solution: Incorrect. This does not result in hydrogen chloride but instead produces ammonium chloride.
Step 3: Conclusion.
The correct answer is (A) Sodium chloride and concentrated sulphuric acid, which is the standard method of preparation of hydrogen chloride.