Question

Calculate the oxidation number of Cr in Cr2 O1 2-​

Answer 1

This is the dichromate ion,

Oxygen is more electronegative than chromium, so it'll take its usual -2

charge here. There are seven oxygen atoms, so the total charge is

-2 multiplied by 7=-14

Let

x

be the oxidation number of two chromium atoms. So, we got:

x+(-14)=-2

X-14=-2

x=12

So, two chromium atoms have a total oxidation number of +12

. Since one is not more electronegative than the other, we can divide the number by two to get one chromium's oxidation number.

12/2=6

So, a chromium atom here has an oxidation number of +6

Hope it will be helpful for you