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On the basis of information available fr...

On the basis of information available from the reaction
`(4)/(3)Al+O_(2) rarr (2)/(3)Al_(2)O_(3),DeltaG = -827kJ mol^(-1)` of `O_(2)`, the minimum emf required to carry out of the electrolysis of `Al_(2)O_(3)` is `(F=96,500 C mol^(-1))`

A

4.28 V

B

6.42 V

C

8.50 V

D

2.14 V

Text Solution

Verified by Experts

The correct Answer is:
D
`4//3 Al+O_(2) to 2//3 Al_(2)O_(3)`,
`" "DeltaG=-827 KJ "mol"^(-1)`
Number of electrons involoved =4
`DeltaG^(@)=-nFE^(@)`
`E^(@)~~(827000)/(4xx96500)=2.14V`
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