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  • Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A: Magnesium can reduce <

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A: Magnesium can reduce \mathrm{Al}_{2} \mathrm{O}_{3} at a temperature below 1350^{\circ} \mathrm{C}, while above 1350^{\circ} \mathrm{C} aluminium can reduce \mathrm{MgO}.

Reason R: The melting and boiling points of magnesium are lower than those of aluminium.

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

Option: 1

Both A and R are correct, and R is correct explanation of A.


Option: 2

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


Option: 3

A is correct R is not correct.


Option: 4

A is not correct, R is correct.


Answers (1)

best_answer

As we have learnt,

In Ellingham diagram, Mg can reduce \mathrm{Al}_{2} \mathrm{O}_{3} at a temperature below 1350^{\circ} \mathrm{C}, while above 1350^{\circ} \mathrm{C} Al can reduce MgO. The melting and boiling points of magnesium are lower than those of Aluminium.

\\\mathrm{M.P. ~of\; \mathrm{Mg}=924 \mathrm{~K}, B. P. of\; } \mathrm{Mg}=2745 \mathrm{~K}\; \\ \text{M.P. of Al=933} \mathrm{~K}, \mathrm{B .P. ~of \; A l=2740 \mathrm{~K}}

Both Assertion A and Reason R are correct. But R is not the correct explanation of A, because A can be explained by Gibb's free energy.

Hence, Option (2) is correct.

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