1.

The Gibb's energy for the decomposition of Al_(2)O_(3) at 500^(@) C is as follows: 2/3Al_(2)O_(3) to 4/3 Al + O_(2) , DeltaG = +966 kJ mol^(-1) The potential difference needed for electrolytic reduction of Al_(2)O_(3)at 500^(@) C is at least

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5.0 V
4.5 V
3.0 V
2.5 V

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