Question

Which change could take place at the anode of an electro chemical cell?

• A. ${Cu}^{2+}$ to $Cu$
• B. ${ClO}_3^{-}$ to ${ClO}^{-}$
• C. ${Cl}^{-}$ to ${Cl}_2$
• D. $H^{+}$ to $H_2$
• E. $O_2$ to $H_{2}O$

Answer 1

The correct option is C ${Cl}^{-}$ to ${Cl}_2$

Option C is the correct answer.

In an electrochemical cell, oxidation takes place in the anode. Among all the options, in C we find that, $C{l}^{-}$ is oxidized from $-1$ state to $0$ state (molecular $Cl$ has oxidation number $0$).

Thus change C or oxidation will take place in the anode.