In thermal decomposition of lead nitrate the yellow solid residue is of which substance?
Answer and explanation
Correct answer: Lead oxide
Lead nitrate decomposes on strong heating according to 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide escapes as a brown gas and oxygen as a colourless gas, leaving lead oxide as the solid residue. Lead oxide is yellow when hot and may appear differently on cooling. Chloride, sulphate, and carbonate residues require other anions and are not formed here.
Frequently asked questions
What is the correct answer to this question?
Lead oxide
Why is this the correct answer?
Lead nitrate decomposes on strong heating according to 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Nitrogen dioxide escapes as a brown gas and oxygen as a colourless gas, leaving lead oxide as the solid residue. Lead oxide is yellow when hot and may appear differently on cooling. Chloride, sulphate, and carbonate residues require other anions and are not formed here.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
