Question

The oxidation number of chromium in sodium tetrafluoro oxochromate complex is.

• A. II
• B. IV
• C. VI
• D. III

Answer 1

Answer: (B)

IV

Answer 2

$Na_{2}\lbrack CrF_{4}O\rbrack$

$x + 4( - 1) + ( - 2) = - 2$

$x - 6 = - 2$⇒$x = + 4$.