Question

Assertion (A): HCl gas is dried by passing through concentrated H$_2$SO$_4$
Reason (R): HCl gas reacts with NH$_3$ that gives white fumes

• A. Both (A) and (R) are correct and R is the correct explanation of A
• B. Both (A) and (R) are correct but R is not the correct explanation of A
• C. (A) is correct but (R) is incorrect
• D. (A) is incorrect but (R) is correct

Hint:

Always distinguish between correct statements and whether one logically explains the other.

Answer 1

The Correct Option is B

HCl gas is dried using concentrated sulfuric acid because H$_2$SO$_4$ is a good dehydrating agent. The reason statement is also correct — HCl reacts with NH$_3$ to form white fumes of NH$_4$Cl. However, this is not the reason for using H$_2$SO$_4$ to dry HCl.