AP EAMCET · Chemistry · Electrochemistry
Observe the following Ellingham diagram, and identify the incorrect statement regarding it
- A At point ' \(\mathrm{A}\) ' for the reduction of \(\mathrm{Al}_2 \mathrm{O}_3\) by \(\mathrm{Mg}\), \(\Delta \mathrm{G}^{\circ}=0\)
- B Below \(1673 \mathrm{~K}, \mathrm{Mg}\) can reduce \(\mathrm{Al}_2 \mathrm{O}_3\) to \(\mathrm{Al}\)
- C Below \(1673 \mathrm{~K}, \mathrm{Al}\) can reduce \(\mathrm{MgO}\) to \(\mathrm{Mg}\)
- D Above \(1673 \mathrm{~K}, \mathrm{Al}\) can reduce \(\mathrm{MgO}\) to \(\mathrm{Mg}\)
Answer & Solution
Correct Answer
(C) Below \(1673 \mathrm{~K}, \mathrm{Al}\) can reduce \(\mathrm{MgO}\) to \(\mathrm{Mg}\)
Step-by-step Solution
Detailed explanation
Since the \(\frac{4}{3} \mathrm{Al}+\mathrm{O}_2 \rightarrow \frac{2}{3} \mathrm{Al}_2 \mathrm{O}_3\) line lies above the \(2 \mathrm{Mg}+\mathrm{O}_2 \rightarrow 2 \mathrm{MgO}\) line, \(\mathrm{Al}\) cannot reduce \(\mathrm{MgO}+\mathrm{Mg}\) below \(1673 \mathrm{~K}\). This…
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