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The Gibbs energy for the decomposition of Al ₂ O ₃ at 500^ C is as follows : 2 3 Al ₂ O ₃ 4 3 Al + O ₂, _ r G =+966 ~kJ ~mol ⁻¹ The potential difference needed for electrolytic reduction of Al ₂ O ₃ at 500^ C is at least

Options

  1. A4.5 ~V
  2. B3.0 ~V
  3. C2.5 ~V
  4. D5.0 ~V

Correct answer

C. 2.5 ~V

Step-by-step solution

G=-n F E E= - G n F E=- 966 10^3 4 96500 =-2.5 ~V The potential difference needed for the reduction =2.5 ~V

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