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The Gibbs energy for the decomposition o...

The Gibbs energy for the decomposition of `Al_2O_3` at `500^@C` is as follows:
`2/3Al_2O_3rarr4/3Al+2O_2`
The potential difference needed for electrolytic reduction of `Al_2O_3` at `500^@C` at least

A

2.5V

B

5.0V

C

3.0V

D

4.5V

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