Question

The oxidation number of chromium in sodium tetrafluorido oxochromate complex is

• A. $II$
• B. $IV$
• C. $VI$
• D. $III$

Answer 1

Answer: (B)

$N{a}_2[Cr{F}_{4}O]$
$x+4(-1)+(-2)=-2$
$x-6=-2\Rightarrow x=+4$