ANSWER
Oxidation reaction
EXPLANATION
In an electrochemical cell, oxidation reaction occurs at the anode. This involves the loses of electrons, the electrons then flow through a wire to the cathode.
At the anode, oxidation reaction will take place
[tex]\text{ X}_{(s)\text{ }}\text{ }\rightarrow X_{(aq)}^{+\text{ }}+\text{ e}^-[/tex]