b. Choose Which of the following is a reduction reaction?
(CuO + H2 → Cu + H2O, H2S +Cl2 → 2HCI + S, 2KI + H202 2KOH + 12, Zn +2HCl → ZnCl2 + H2)
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Explanation:
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. In redox reaction the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
In the reaction : CuO+H
2
⟶Cu+H
2
O
n the reaction H
2
is oxidized since it has lost electrons and Cu is reduced since it has gained electrons.
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