Reaction 4, where copper(II) oxide reacts with sulfuric acid to form copper(II) sulfate and water is best classified as a precipitation reaction an acid-base reaction a decomposition reaction an oxidation-reduction reaction

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Redox Reactions

Redox reactions are considered to be the chemical reactions involving both oxidation and reduction processes. They are actually oxidation-reduction reactions. The term redox is made from two words where “red” comes from reduction and “ox” comes from oxidation. During a redox reaction electron transfer takes place in such a way that one chemical compound gets reduced and the other one gets oxidized.