Question

The oxidation number of chromium in potassium dichromate is

• A. 6
• B. 4
• C. 3
• D. 2

Answer 1

Answer: (A)

6

Answer 2

Potassium diclromate : $K _{2} Cr _{2} O _{7}$

Let the Oxidation state of $Cr$ be $x$
$\Rightarrow 2 \times(+1)+2 x+7 \times(-2)=0$
$\Rightarrow x=+6$