When lead nitrate is heated, a brown gas is evolved. Which equation correctly represents this thermal decomposition?
Answer and explanation
Correct answer: \(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)
Thermal decomposition of lead nitrate produces lead oxide \(PbO\), brown nitrogen dioxide \(NO_2\) gas, and oxygen \(O_2\). In option A, both sides contain \(2\) Pb, \(4\) N, and \(12\) O atoms, so the equation is balanced. In option B, oxygen atoms are not balanced: there are \(6\) on the left but \(7\) on the right.
Frequently asked questions
What is the correct answer to this question?
\(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)
Why is this the correct answer?
Thermal decomposition of lead nitrate produces lead oxide \(PbO\), brown nitrogen dioxide \(NO_2\) gas, and oxygen \(O_2\). In option A, both sides contain \(2\) Pb, \(4\) N, and \(12\) O atoms, so the equation is balanced. In option B, oxygen atoms are not balanced: there are \(6\) on the left but \(7\) on the right.
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.
