Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (At. Mass = 27 amu ; 1 Faraday = 96,500 Coulombs ). The cathode reaction is
To prepare 5.12 kg of aluminium metal by this method would require
A
of electricity
B
of electricity
C
of electricity
D
of electricity
Text Solution
Verified by ExpertsThe correct answer is:
A
27 gm of Al is obtained by passing a current of 3 × 96500 C.
1 gm of Al is obtained by passing a current of 
∴ ∴ 5.12 × 10 3 gm of Al is obtained by passing a current of 
= 1.83 × 10 7 C × 3 = 5.49 × 10 7 C.
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