Question

Assertion (A): HCI gas is collected by downward delivery. 

Reason (R): HCl gas is heavier than air.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(1)

Explanation:

HCl gas is collected by downward delivery because it is highly soluble in water and therefore cannot be collected over water. Therefore, the Assertion (A) is true.

HCl gas is heavier than air, so it displaces air upward and can be collected by downward delivery. Therefore, the Reason (R) is true and correctly explains the Assertion.

Hence, both A and R are true, and R is the correct explanation of A.