4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H ions in solution by the same quantity of electric charge will be

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is
(Atomic mass : Al = 27)

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25^oC. The equilibrium constant of the reaction would be

On the basis of the information available from the reaction,

4/3Al + O₂ $$ \to $$ 2/3Al₂O₃,   $$\Delta $$G = $$-$$ 827 kJ mol^$$-$$1 of O₂,

the minimum e.m.f. required to carry out an electrolysis of Al₂O₃ is
(F = 96500 C mol^$$-$$1)