NEET2003ChemistryElectrochemistryActual
On the basis of information available from the reaction 4 3 Al + O ₂ 2 3 Al ₂ O ₃, G =-827 ~kJ mol ⁻¹ of O ₂ , the minimum e.m.f required to carry out an electrolysis of Al ₂ O ₃ is ( F = .96500 C mol ⁻¹ ):
Options
- A2.14 ~V
- B4.28 ~V
- C6.42 ~V
- D8.56 ~V
Correct answer
A. 2.14 ~V
Step-by-step solution
For O ₂, G =-n FE ^ E ^ = G -n ~F = -8,27,000 -2 96,500 =4.28 Minimum EMF required to carry out electrolysis of Al ₂ O ₃= 4.28 2 =2.14 ~V