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When electricity is passed through molte...

When electricity is passed through molten electrolyte consisting of alumina and cryolite 13.5 g of Al are deposited. The number of faradays of electricity passed must be

A

2

B

1.5

C

1

D

0.5

Text Solution

Verified by Experts

The correct Answer is:
B
`Al^(3+)+underset(3F)(3e^(-)rarrunderset(1"mole"=27g)(Al)`
To produce 27g of Al electricity required=3F.
Thus to produce 3.5g of Al electricity required.
`(3)/(2)=1.5F`
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