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ICSE Class 10 Chemistry Question 3 of 13

Practical Work — Question 11

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Question 11

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.
Answer

Both A and R are true and R is the correct explanation of A.

Explanation— H2S is colourless gas having a foul smell of rotten eggs. When H2S is passed through lead nitrate solution, a black precipitate of PbS is formed.

Pb(NO3)2 + H2S ⟶ PbS ↓ + 2HNO3

Hence, both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).