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In the reaction CuO + H$_2$ $\longrightarrow$ Cu + H$_2$O, which statement is correct?
Aboth CuO and H$_2$ are reduced
BCuO is reduced and H$_2$ is oxidised
Cboth CuO and H$_2$ are oxidised
DCuO is oxidised and H$_2$ is reduced
Answer & Solution
Correct answer: B. CuO is reduced and H$_2$ is oxidised
1. CuO loses its oxygen atom to become Cu; loss of oxygen is reduction, so CuO is reduced.
2. H$_2$ gains that oxygen to form H$_2$O; gain of oxygen is oxidation, so H$_2$ is oxidised.
3. Oxidation and reduction occur together, making this a redox reaction.
4. The option reversing the roles is wrong, and the 'both reduced' or 'both oxidised' options ignore that one species must be oxidised while the other is reduced.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.52_
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