The Gibbs energy for the decomposition of\[A{{l}_{2}}{{O}_{3}}\] at \[{{500}^{o}}C\] is as follows |
\[\frac{2}{3}A{{l}_{2}}{{O}_{3}}\xrightarrow[{}]{{}}\frac{4}{3}Al+{{O}_{2}};\] \[{{\Delta }_{r}}G=+\,960\,kJ\,mo{{l}^{-1}}\] |
The potential difference needed for the electrolytic reduction of aluminium oxide \[(A{{l}_{2}}{{O}_{3}})\] at \[{{500}^{o}}C\] is at least [AIPMT (M) 2012] |
A) 4.5 V
B) 3.0 V
C) 2.5 V
D) 5.0 V
Correct Answer: C
Solution :
The half cell reaction are at anode At cathodeNet reaction |
or |
Here, |
Potential difference |
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