Verified Solution • 2025–26 Session moderate

QJEEM22Che987: JEE Main 2022 Chemistry - Class 12 JEEM22Che987 Solution: Given are two statements one is labelled as Assertion A and…

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 :

Multiple Choice Options

  • 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.

Step-by-Step Verified Solution

Magnesium can reduce Al2O3 at a temperature below 1350°C while above 1350°C aluminium can reduce MgO because below 1350°C Δ\Delta G of MgO (formation) is more negative and above 1350°C Δ\Delta G of Al2O3 (formation) is more negative.

The melting and boiling point of magnesium are lower than those of aluminium but it is not the correct reason.

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