Verified Solution • 2025–26 Session moderate

QJEEM23Che206: JEE Main 2023 Chemistry - Class 12 JEEM23Che206 Solution: Given below are two statements: one is labelled as Assertion A…

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : In the Ellingham diagram, a sharp change in slope of the line is observed for Mg→MgO\mathrm{Mg} \rightarrow \mathrm{MgO} at ∼1120∘C\sim 1120^{\circ} \mathrm{C}

Reason R: There is a large change of entropy associated with the change of state

In the light of the above statements, choose the correct answer from the options given below

Multiple Choice Options

  • A Both A\mathbf{A} and R\mathbf{R} are true and R\mathbf{R} is the correct explanation of A\mathbf{A}
  • B A\mathbf{A} is false but R\mathbf{R} is true
  • C Both A\mathbf{A} and R\mathbf{R} are true but R\mathbf{R} is NOT the correct explanation of A\mathbf{A}
  • D A\mathbf{A} is true but R\mathbf{R} is false

Step-by-Step Verified Solution

In the Ellingham diagram, a sharp change in slope of the line is observed for Mg−MgO\mathrm{Mg}-\mathrm{MgO} at ∼1120∘C\sim 1120^{\circ} \mathrm{C} because that is the boiling point of magnesium.

There is a large increase in entropy associated with the change of state of magnesium. So, both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A)(A) .

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