1.

Aluminium oxide may be electrolysed at 1000^(@)C to furnish aoluminium metal (At. Mass=27amu,1 faraday=96,500) Al^(3+)+3e^(-)toAl^(0) To prepare 5.12 kg of aluminium metal by this method would require

Answer»

`5.49xx10^(7)C` of electricity
`1.83xx10^(7)C` of electricity
`5.49xx10^(4)C` of electricity
`5,49xx10^(1)C` of electricity

Solution :27 gm of Al is obtained by PASSING a CURRENT of
`3xx96500C`
`because` gm of Al is obtained by passing a current of `3xx(96500)/(27)C`.
`therefore5.12xx10^(3)gm` of Al is obtained by passing a current of `3xx(96500)/(27)xx5.12xx1000`
`=1.83xx10^(7)Cxx3=5.49xx10^(7)C`.


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