For the reaction, 2cr2+ + cl2(g) > 2cr3+ + 2cl- ecell (standard conditions) = 1.78v

calculate ecell (standard conditions) for the related reaction cr3+ + cl- > cr2+ + 1/2cl2(g)

Eºcell = -1.78 V

Explanation:

The Eº cell is an intensive property, i.e they do not depend on the quantity of material present and the desired reaction in our problem  is exactly half the reverse of the one given, the Eºcell will then  be the negative of the first then Eºcell is -1.78 V and the redox reaction will be non-spontaneous as opposed to the first.

what are the choices?

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /