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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.

Related tags

Thermal DecompositionChemical EquationsBalancing EquationsLead NitrateNitrogen DioxideClass 10 Science

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