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Which is a redox reaction?(1) H + Cl → HCl(2) NaOH + HCl → NaCl + H₂O(3) Fe + 2HCl → FeCl₂ + H₂(4) MgO + H₂SO₄ → MgSO₄ + H₂O

Sagot :

Oxidation-reduction reaction, also called redox reaction, any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes.

As you can see, the reaction (3) changes its oxidation numbers as follows:

For that reason, it is a redox reaction.

The other reactions don't change their oxidation numbers so they aren't redox reactions.

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