The following change occurs in acidic solution: s^2+ + cr_2o_7^2+ s + cr^3+ complete and balance the foregoing equation. in the balanced equation, for every mole of cr_2o_7^2 that reacts, moles of h+ are consumed. a. 5 b. 7 c. 8 d. 10 e. 14

Answer : The correct option is, (E) 14

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.

Rules for the balanced chemical equation in acidic solution are :

The given chemical reaction is,

The oxidation-reduction half reaction will be :

Oxidation :

Reduction :

First balance the main element in the reaction.

Oxidation :

Reduction :

Now balance oxygen atom on both side.

Oxidation :

Reduction :

Now balance hydrogen atom on both side.

Oxidation :

Reduction :

Now balance the charge.

Oxidation :

Reduction :

In order to balance the charge, we multiply oxidation reaction by 3. Thus, added both equation, we get the balanced redox reaction.

The balanced chemical equation in acidic medium will be,

From the balanced chemical equation we conclude that, the number of moles of consumed from every mole of are 14 moles.

Hence. the correct option is, (E) 14

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