In electrochemical corrosion of metals, the metal undergoing corrosion
A. anode
B. cathode
C. neither anode nor cathode
D. either anode or cathode depending upon its standard reduction potential.
Correct Answer - A
(a) Al anode : `Fe to Fe^(2+)+2e^(-)xx2`.
`("Al cathode" : O_(2)+2H_(2)O+4e^(-) to 4OH^(-))/("Overall reaction" , 2Fe+O_(2)+2H_(2)O to 2Fe(OH)_(2))`
`:.` It is the correct option.