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Aluminium oxide may be electorlysed at 1...

Aluminium oxide may be electorlysed at `1000^@C` to furnish aluminim metal (Atomic Mass `= 27 ` amu, `1 F = 96, 500 C)`. The cathode reaction is
`Al^3 + 3d^(-) rarr Al^@`
To prepare ` 5.12 kg` of aluminimu metal by this method woold require .

A

`5.49 xx 10^(4)C` of electric charge

B

`5.49 xx 10^(1)C` of electric charge

C

`5.49 xx 10^(7)C` of electric charge

D

`1.83 xx 10^(7)C` of electric charge

Text Solution

Verified by Experts

The correct Answer is:
C
`(W)/(E) =(Q)/(F)`
`(5.12 xx 10^(3))/(9) =(Q)/(96500)`
`Q = (5.12 xx 10^(3) xx 96500)/(9) = 5.49 xx 10^(7)C`
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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:

Calculate the amount of electricity required to deposite 0.9 g of aluminium by electrolysis of a salt containing its ion, if the electrode reaction is Al^(3+)+3e^(-)rarrAl , (atomic mass of Al =27, 1F=96500C )

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  9. The cell , Zn | Zn^(2+) (1M) || Cu^(2+) (1M) Cu (E("cell")^@ = 1. 10 V...

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  10. Given E(Cr^(3+)//cr)^@ =- 0.72 V, E(Fe^(2+)//Fe)^@ =- 0.42 V. The pote...

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  11. Given,{:(E(Fe^(3+) //Fe)^o + 3e Cr E^o =- 0.036 V),(E(Fe^(3+) //Fe)^o...

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  12. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as ...

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