Question

$\mathrm{CuO}+{\mathrm{H}}_2\to {\mathrm{H}}_2\mathrm{O}+\mathrm{Cu}$, reaction is an example of

• A. redox reaction
• B. decomposition reaction
• C. neutralization
• D. analysis reaction

Answer 1

The correct option is A

redox reaction

Explanation for correct option:

A: The reaction corresponding to the gain of Oxygen (O) or loss of Hydrogen (H) by a species is called an oxidation reaction. On the other hand, the reaction corresponding to the loss of Oxygen or gain of Hydrogen by a species is called a reduction reaction.

The reaction in which oxidation and reduction reactions take place simultaneously is known as redox reactions.

In the given reaction $\mathrm{CuO}+{\mathrm{H}}_2\to {\mathrm{H}}_2\mathrm{O}+\mathrm{Cu}$, Copper oxide (CuO) is losing oxygen and hydrogen molecule (H₂) is gaining oxygen. Therefore, Copper oxide undergoes reduction, while Hydrogen undergoes oxidation. Hence, the given reaction is a redox reaction.

Explanation for incorrect options:

B: In the decomposition reaction, one large chemical species dissociates or splits into smaller chemical species. Example: $2\mathrm{HBr}\to {\mathrm{H}}_2+{\mathrm{Br}}_2$

In the reaction $\mathrm{CuO}+{\mathrm{H}}_2\to {\mathrm{H}}_2\mathrm{O}+\mathrm{Cu}$, on the reactant side two chemical species are present thus, it is not a decomposition reaction.

C: In the neutralization reaction, an acid reacts with a base to form salt and water. Example: $\mathrm{HCl}+\mathrm{NaOH}\to \mathrm{NaCl}+{\mathrm{H}}_2\mathrm{O}$

Since CuO and H₂ are neither acid nor base, thus, the given reaction is not a neutralization reaction.

D: Analysis reactions are also called decomposition reactions. Since in the reaction $\mathrm{CuO}+{\mathrm{H}}_2\to {\mathrm{H}}_2\mathrm{O}+\mathrm{Cu}$, on the reactant side two chemical species are present, it is not an analysis reaction.

Final Answer:

Hence, option (A) is correct. The given reaction is an example of a redox reaction.