Which equation describes a reduction?

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Question:

Which equation describes a reduction?

Mg(s)—Mg2+ (aq) + 2e –
201 + 2e ->201
Na(s) — Nat(aq) + e
Al(s)— A3+ (aq) + 3e –

Answer:

Answer : The reduction will be

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given half reactions is:

This reaction is an oxidation reaction because in this reaction, the loss of electrons takes place.

(b) The given half reactions is:

This reaction is an reduction reaction because in this reaction, the gain of electrons takes place.

(c) The given half reactions is:

(d) The given half reactions is:

Hence, the reduction will be

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