Question

What is the oxidation number of $K$ in $K_{2}C{r}_2{O}_2$?

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is A 1

Potassium or $K$ is a group 1A element. It's most common oxidation number is $+1$.

Example, in $KMn{O}_4$, $K_{2}S{O}_4$, $KCl$, $KHS{O}_4$ etc, the oxidation state of $K$ is $+1$. Thus in $K_{2}C{r}_2{O}_2$ too the oxidation number of $K$ is $+1$

Option $A$ is the correct answer.