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AIPMT MAINS2012Chemistry-Electrochemistry

AIPMT MAINS 2012 Chemistry Electrolytic Cells MCQ Question

Type: MCQ-numerical-Hard-Class 12

The Gibbs' energy for the decomposition of Al₂O₃ at 500°C is as follows:

23Al2O3→43Al+O2;ΔG=+960kJ mol−1\frac{2}{3} \text{Al}_2\text{O}_3 \rightarrow \frac{4}{3} \text{Al} + \text{O}_2 ; \Delta G = +960 \text{kJ mol}^{-1}

The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500°C is at least:

A

5 V

B

0 V

C

5 V

D

5.0 V

Correct Answer

Option C

Detailed Explanation

Using the equation ΔG = -nFE°, the potential E° is calculated to be−2e^{-2}.5 V, indicating at least 2.5 V is needed for reduction.

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