Question

On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed ?

• A. Lead nitrate
• B. Sulphur
• C. Nitric oxide
• D. Nitrous oxide

Answer 1

The Correct Option is D

To solve this question, we need to understand the chemical reaction that occurs when Lead Sulphide (PbS) reacts with dilute nitric acid (HNO₃).

The chemical reaction between lead sulphide and dilute nitric acid can be represented as follows:

\(PbS + 4HNO_3 \rightarrow Pb(NO_3)_2 + 2H_2O + 2NO_2 + S\)

Breaking down the reaction, we can observe the formation of the following products:

• Lead Nitrate (Pb(NO₃)₂)
• Sulphur (S)
• Nitrogen Dioxide (NO₂)
• Water (H₂O)

From the given options, we can analyze and conclude:

• Lead Nitrate: This compound is formed as a primary product in the reaction.
• Sulphur: This is also formed as a product as shown in the reaction.
• Nitric Oxide (NO): This compound is not part of the given reaction, so it cannot be formed here.
• Nitrous Oxide (N₂O): This compound is the one not mentioned in any part of the reaction and is not a typical product of the reaction of lead sulphide with dilute nitric acid.

Based on the analysis, the correct answer is:

Nitrous oxide (N₂O) is not formed in this reaction.

Answer 2

The reaction between Lead Sulphide (PbS) and dilute nitric acid (\(HNO_3\)) proceeds as follows:

\(PbS + 2HNO_3 \rightarrow Pb(NO_3)_2 + NO + S + H_2O\)

Key Points:

1. The products of this reaction are:
   • Lead nitrate (\(Pb(NO_3)_2\)) – a soluble salt.
   • Nitric oxide (NO) – a gaseous product.
   • Sulphur (S) – a precipitate.
   • Water (\(H_2O\)).
2. Nitrous oxide (\(N_2O\)) is not formed during this reaction.