Question

Which of the following reactions is possible at anode

• A. $\text{2 C}\text{r}^{\text{3+}}\text{ + 7}\text{H}_{2}\text{O } \rightarrow \text{C}\text{r}_{2}{O_{7}}^{\text{2-}}\text{ + 14}\text{H}^{+}$
• B. $F_{2}\ \rightarrow \text{2}\text{F}^{-}$
• C. $O_{2}\text{ + 2}\text{H}^{+} \rightarrow \text{ }\text{H}_{2}O$
• D. Displacement reaction

Answer 1

Answer: (A)

$\text{2 C}\text{r}^{\text{3+}}\text{ + 7}\text{H}_{2}\text{O } \rightarrow \text{C}\text{r}_{2}{O_{7}}^{\text{2-}}\text{ + 14}\text{H}^{+}$

Answer 2

Here Cr3+ is oxidised to$C_{2}O_{7}^{2 -}$