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Which of the following is a decomposition reaction but not an electrolytic decomposition reaction?

Answer and explanation

Correct answer: Decomposition of lead nitrate on heating

On heating, lead nitrate undergoes thermal decomposition: \(2\mathrm{Pb(NO_3)_2} \xrightarrow{\Delta} 2\mathrm{PbO} + 4\mathrm{NO_2} + \mathrm{O_2}\). The energy is supplied by heat, not by electric current, so it is not electrolytic decomposition. In contrast, acidified water in A, molten sodium chloride in B, and copper chloride solution in C decompose because of electric current.

Related tags

Class 10 ScienceChemical ReactionsDecomposition ReactionThermal DecompositionElectrolysisLead Nitrate

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