question_answer

The Gibbs energy for the decomposition of \[A{{l}_{2}}{{O}_{3}}\]at\[500{}^\circ C\]is as follows: \[\frac{2}{3}A{{l}_{2}}{{O}_{3}}\to \frac{4}{3}Al+{{O}_{2}},\]                                        \[{{\Delta }_{r}}G=+966\,kJ\,mo{{l}^{-1}}\] The potential difference needed for electrolytic reduction of\[A{{l}_{2}}{{O}_{3}}\]at\[500{}^\circ C\]is at least       AIEEE  Solved  Paper-2010

A) 5.0 V

B)                        4.5 V     

C)        3.0 V     

D)        2.5 V