Question

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is:

• A. 4
• B. 6
• C. 2
• D. 3

Answer 1

Answer: (D)

3

$C{r}_2{O}_7^{2-}+6I^{-}+14H^{+}⟶2C{r}^{3+}+3I_2+7H_{2}O$

$C{r}_2{O}_7^{2-}$ is converted to $C{r}^{3+}$.

In this reaction, the final product formed is $C{r}_2{O}_3$, where the oxidation state of Cr is +3.