Question

Assign the oxidation numbers to all the atoms in each ion. Cr2O72-

Answer 1

Answer:

Cr = +6 , O = -2

Explanation:

Let the oxidation number of Cr be x.

2x + 7 (-2) = -2

2x - 14 = -2

2x = 14 - 2

2x = 12

x = 12/2

x = +6