Given are two statements one is labelled as Assertion A and other is labelled as Reason R.
Assertion A : Magnesium can reduce Al2O3 at a temperature below 1350$^\circ$C, while above 1350$^\circ$C, while above 1350$^\circ$C aluminium can reduce MgO.
Reason R : The melting and boiling points of magnesium are lower than those of aluminium.
n light of the above statements, choose most appropriate answer from the options given below :
Solution
Magnesium can reduce Al<sub>2</sub>O<sub>3</sub> at a temperature
below 1350°C while above 1350°C aluminium can
reduce MgO because below 1350°C $\Delta$G of MgO
(formation) is more negative and above 1350°C $\Delta$G
of Al<sub>2</sub>O<sub>3</sub> (formation) is more negative.<br/><br/>
The melting and boiling point of magnesium are
lower than those of aluminium but it is not the
correct reason.
About this question
Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family
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