Question

  complete and balance the following reactions ?   uo2+ +cr o^2- 7 ـــــــــــــــــــــ uo2+ +cr3+

Answer 1

In order to complete and balance the following reactions, you should add a Fe into it. So it will look like  uo2+ +cr o^2- 7 ـــــــــــــــــــــ uo2+ +cr3+Fe. The answer to the following given statement or missing answer is Fe. 

Answer 2

The answer will be Fe. Hope it help!