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Which of the following reactions is not an oxidation-reduction (redox) reaction?

Answer and explanation

Correct answer: \(\mathrm{CaCO_3 \rightarrow CaO + CO_2}\)

In \(\mathrm{CaCO_3 \rightarrow CaO + CO_2}\), the oxidation numbers of calcium \((+2)\), carbon \((+4)\), and oxygen \((-2)\) remain unchanged on both sides. Therefore, neither oxidation nor reduction occurs, so it is not a redox reaction. In contrast, in option B, Zn changes from \(0\) to \(+2\) and \(\mathrm{Cu^{2+}}\) changes from \(+2\) to \(0\), making it a redox reaction.

Related tags

Chemical ReactionsRedox ReactionsOxidation NumberDecomposition ReactionClass 10 Science

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