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Which half-reaction equation represents the
reduction of a potassium ion?
(1) K+ + e-- ==>K (3) K+ ==>K + e--
(2) K + e-- ==> K+ (4) K==> K+ + e--

Sagot :

Lulu1991idn
The reduction reaction is the gain of electrons while oxidation reaction is the loss of electrons. For potassium ion(K+), the reaction should be K+ + e- ==> K. So the answer is (1).

Answer : The correct option is, (1) [tex]K^++e^-\rightarrow K[/tex]

Explanation :

Oxidation-reduction reaction : It is a type of reaction where the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is a 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 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.

As per question, the half-reaction equation of reduction of a potassium ion will be :

[tex]K^++e^-\rightarrow K[/tex]

In this reaction, the oxidation state of potassium changes from (+1) to (0) that means the oxidation state decreases. So, this reaction shows the half-reaction equation of reduction of a potassium ion.

Therefore, the correct option is, (1) [tex]K^++e^-\rightarrow K[/tex]

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