13. how many electrons are transferred in the following reaction? (the reaction is unbalanced.) fe(s) + i'(aq) 12(s) + fe3+(aq) a) 1 b) 2 c) 6 d) 3 e) 4

Answer : The correct option is, (C) 6

Explanation :

Oxidation-reduction reaction : It is a reaction in which oxidation and reduction reaction occur simultaneously.

Oxidation reaction : It is the reaction in which a substance looses its electrons. In this oxidation state increases.

Reduction reaction : It is the reaction in which a substance gains electrons. In this oxidation state decreases.

The given unbalanced chemical reaction is,

Half reactions of oxidation and reduction are :

Oxidation :        ......(1)

Reduction :         .......(2)

In order to balance the electrons, we multiply equation 1 by 2 and equation 2 by 3, we get:

Oxidation :        ......(1)

Reduction :         .......(2)

The overall balanced chemical reaction will be:

From this reaction we conclude that the electrons are getting transferred from iron to iodine and the number of electrons transferred are 6 electrons.

Hence, the correct option is, (C) 6

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