Aluminium oxide may be electrolysed at `1000^(@)`C to furnish aluminium metal (Atomic mass = 27 amu, 1 Faraday = 96500 Coulomb). The cathode reaction is `Al^(3+) + 3e^(-) rightarrow Al`. To prepare 5.12 kg of aluminium metal by this method would require:A. `5.49xx10^(4)C` of electricityB. `5.49xx10^(1)C` of electricityC. `5.49xx10^(7)C` of electricityD. `1.83xx10^(7)C` of electricity.

Aluminium oxide may be electrolysed at `1000^(@)`C to furnish aluminiu

1.	Aluminium oxide may be electrolysed at `1000^(@)`C to furnish aluminium metal (Atomic mass = 27 amu, 1 Faraday = 96500 Coulomb). The cathode reaction is `Al^(3+) + 3e^(-) rightarrow Al`. To prepare 5.12 kg of aluminium metal by this method would require:A. `5.49xx10^(4)C` of electricityB. `5.49xx10^(1)C` of electricityC. `5.49xx10^(7)C` of electricityD. `1.83xx10^(7)C` of electricity.
Answer» Correct Answer - C `Al^(3+)+3e^(-)rarrAl` `3xx96500 27g` To produce 27g of Al, electricity required `=3xx96500C` `therefore` To produce 5.12kg of Al, electricity required `=(3xx96500)/(27)xx5.12xx10^(3)C` `=5489.78xx10^(3)C=5.49xx10^(7) C`

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