Ncert Exercises & Solutions

Which of the following electrodes will act as anodes, which are connected to Standard Hydrogen Electrode?

1. $Al / {Al}^{3 +} E^{⊝} = - 1.66$

2. $Fe / {Fe}^{2 +} E^{⊝} = - 0.44$

3. $Cu / {Cu}^{2 +} E^{⊝} = + 0.34$

4. $F_{2} (g) / 2 F^{-} (aq) E^{⊝} = 02.87$

(a, b)

All electrodes which have negative electrode potential are stronger reducing agents than H₂ gas and hence acts as anodes when connected to standard hydrogen electrodes. Thus,

{Al}^{3 +} / Al (E^{⊝} = 1.66 V)

and

{Fe}^{2 +} / Fe (E^{⊝} = 0.44 V)

act as the anode.