Which of the following statements is not correct? 1. Reduction of alumina to give aluminium by magnesium is…
Which of the following statements is not correct?
1. Reduction of alumina to give aluminium by magnesium is thermodynamically feasible.
2. The point of intersection of \(\mathrm{AlO}_3\) and \(\mathrm{MgO}\) curves in Ellingham diagram is below \(1665 \mathrm{~K}\).
3. Use of magnesium as reducing agent in metallurgy of aluminium is economical.
4. Ellingham diagram represents the graphical plot of Gibbs energy vs temperature for the formation of the oxides of common metals and reducing agents.
1
2
3
4
Solution
According to the Ellingham's principle and its diagram, statements, 1, 2 and 4 are correct. But, use of magnesium \((\mathrm{Mg})\) as reducing agent in metallurgy of aluminium \((\mathrm{Al})\) is uneconomical. So, statement 3 is not correct.