Obtaining copper sulfate from copper oxides by using sulfuric acid is a:

redox reaction

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neutralisation reaction

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displacement reaction

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both A and B

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Solution

The correct option is B redox reaction
Copper(II) oxide is an amphoteric oxide, so it dissolves in mineral acids such as hydrochloric acid, sulfuric acid or nitric acid to give the corresponding copper(II) salts.Copper does not displace hydrogen from non-oxidising acids like $H C l$ or dilute $H_{2} S O_{4}$ . But, concentrated sulphuric acid is an oxidising agent. So, when copper is heated with conc. $H_{2} S O_{4}$ , a redox reaction occurs and the acid gets reduced to sulphur dioxide
$C u O + H_{2} S O_{4} \to C u S O_{4} + H_{2} O$

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