Question

Assertion (A): On passing H₂S through lead nitrate solution, a black precipitate is formed.

Reason (R): Lead nitrate reacts with H₂S to form a black precipitate of PbS.

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:

When hydrogen sulphide gas is passed through lead nitrate solution, a black precipitate is formed. Therefore, the Assertion (A) is true.

Lead nitrate reacts with H₂S to form black lead sulphide (PbS). Therefore, the Reason (R) is also true.

\[\ce{Pb(NO3)2 + H2S −>PbS + 2HNO3}\]

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