1.

Aluminium oxide may be electrolysed at 100^(@)C to furnish aluminium metal (atomic mass=27 amu). The cathodic reaction is : Al^(3+)+3e^(-) to Al To prepare 5.12 kg of aluminium metal by this reaction would require :

Answer»

`549xx10^(7)" C"` of electricity
`1.83xx10^(7)" C"` of electricity
`5.49xx10^(7)" C "` of electricity
`5.49xx10^(10)" C "` of electricity

Solution :(c ) `AL^(3+)+underset(3xxF)3e^(-) to underset(27G)Al`
To deposit 27 G of Al metal, electricity needed `=3xxF`
To deposit 5120 g of Al metal,
electricity needed `=(3F)/((27 g))xx(5120 g)`
`=568.89 F=5.49xx10^(7)" C "`


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