Question

What is the oxidation number of Cr in K₂Cr₂O₇?

Options

• - 6

• + 12

• + 2

• + 6

Answer 1

+ 6

Explanation:

K₂Cr₂O₇ = (1 × 2) + (x × 2) + [(- 2) × 7]

= 2 + 2x - 14

∴ 2x = 12

∴ x = + 6

∴ Oxidation number of Cr = + 6