Question

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°C, while above 1350°C aluminium can reduce MgO.
Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

In light of the above statements, choose the most appropriate answer from the options given below :

• A. Both A and R are correct, and R is correct explanation of A.
• B. Both A and R are correct, but R is NOT the correct explanation of A.
• C. A is correct R is not correct.
• D. A is not correct, R is correct.

Answer 1

Answer: (B)

Both A and R are correct, but R is NOT the correct explanation of A.

Answer 2

The correct answer is (B) : Both A and R are correct, but R is NOT the correct explanation of A.
The melting and boiling point of magnesium are lower than those of aluminium but it is not the correct reason.
Magnesium can reduce Al2O3 at a temperature below 1350°C while above 1350°C aluminium can reduce MgO because below 1350°C ΔG of MgO (formation) is more negative and above 1350°C ΔG of Al2O3 (formation) is more negative.