Question

Which of the following reaction is possible at anode?

• A. $2Cr^{3 +} + 7H_{2}O \rightarrow Cr_{2}O_{7}^{2 -} + 14H^{+}$
• B. $F_{2}\overset{\quad\quad}{\rightarrow}2F^{-}$
• C. $(1/2)O_{2} + 2H^{+} \rightarrow H_{2}O$
• D. None of these

Answer 1

Answer: (A)

$2Cr^{3 +} + 7H_{2}O \rightarrow Cr_{2}O_{7}^{2 -} + 14H^{+}$

Answer 2

Here, $Cr^{3. +}$is oxidised to $Cr_{2}O_{7}^{2 -}$