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The Gibbs free energy for the decomposition of Al2O3 at 800 K is as follows :
2Al2O→ 4Al + 3O2 , ΔrG = 2898kJ mol-1
The potential difference needed for electrolytic reduction of Al2O3 is at least  
  • a)
    4.5 V
  • b)
    3.0 V
  • c)
    -2.5 V
  • d)
    5.0 V
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The Gibbs free energy for the decomposition of Al2O3 at 800 K is as fo...

n= electrons exchanged = 12 in the given reaction 
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The Gibbs free energy for the decomposition of Al2O3 at 800 K is as fo...
(l) → 4Al(s) + 3O2(g)

The Gibbs free energy change (ΔG) for a reaction is given by the equation:
ΔG = ΔH - TΔS

Where:
ΔH = change in enthalpy
T = temperature in Kelvin
ΔS = change in entropy

To calculate the Gibbs free energy change for the decomposition of Al2O3 at 800 K, we need the values of ΔH and ΔS for the reaction.

Assuming we have the values of ΔH and ΔS, we can substitute them into the equation to calculate ΔG.
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The Gibbs free energy for the decomposition of Al2O3 at 800 K is as follows :2Al2O3→ 4Al + 3O2,ΔrG = 2898kJ mol-1The potential difference needed for electrolytic reduction ofAl2O3 is at least a)4.5 Vb)3.0 Vc)-2.5 Vd)5.0 VCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The Gibbs free energy for the decomposition of Al2O3 at 800 K is as follows :2Al2O3→ 4Al + 3O2,ΔrG = 2898kJ mol-1The potential difference needed for electrolytic reduction ofAl2O3 is at least a)4.5 Vb)3.0 Vc)-2.5 Vd)5.0 VCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Gibbs free energy for the decomposition of Al2O3 at 800 K is as follows :2Al2O3→ 4Al + 3O2,ΔrG = 2898kJ mol-1The potential difference needed for electrolytic reduction ofAl2O3 is at least a)4.5 Vb)3.0 Vc)-2.5 Vd)5.0 VCorrect answer is option 'C'. Can you explain this answer?.
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