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Sagot :
Answer:
D. A reaction in which an atom has gained 1 or more electrons.
Explanation:
The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.
Oxidation:
Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.
Reduction:
Reduction involve the gain of electron and oxidation number is decreased.
Consider the following reactions.
4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl
The oxidation state of copper is changed from +2 to +1 so copper get reduced by gaining the one more electron
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