Metallurgical Engineering > GATE 2026 > Electrolysis
Al2O3 can be electrolyzed with an inert anode or a carbon anode.
Overall reactions are as follows:
Reaction I: For inert anode,
(2/3) Al2O3 (s) → (4/3) Al (l) + O2 (g); ΔG° (in Joules) = 1124800 − 218 T
Reaction II: For carbon anode,
(2/3) Al2O3 (s) + C (s) → (4/3) Al (l) + CO2 (g); ΔG° (in Joules) = 730700 − 218 T
T denotes temperature in Kelvin
Given: Faraday constant = 96500 Coulomb
If inert anode is replaced by carbon anode during electrolysis of Al2O3 at temperature 1300 K, the decrease in the magnitude of decomposition potential between the two reactions (rounded off to two decimal places) is _________________ Volts.
Overall reactions are as follows:
Reaction I: For inert anode,
(2/3) Al2O3 (s) → (4/3) Al (l) + O2 (g); ΔG° (in Joules) = 1124800 − 218 T
Reaction II: For carbon anode,
(2/3) Al2O3 (s) + C (s) → (4/3) Al (l) + CO2 (g); ΔG° (in Joules) = 730700 − 218 T
T denotes temperature in Kelvin
Given: Faraday constant = 96500 Coulomb
If inert anode is replaced by carbon anode during electrolysis of Al2O3 at temperature 1300 K, the decrease in the magnitude of decomposition potential between the two reactions (rounded off to two decimal places) is _________________ Volts.
Correct : 1.02
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