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 most appropriate answer from the options given below -

Magnesium can reduce Al_2O_3 at a temperature below 1350^∘C while above nbsp;1350^∘C aluminium can reduce MgO because below nbsp;1350^∘C nbsp;Δ G of MgO ( ...

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Standard XII

Chemistry

Spontaneity

Given are two...

Question

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.
Assertion A : Magnesium can reduce $A l_{2} O_{3}$ at a temperature below $1350^{\circ} C$ , while above $1350^{\circ} C$ aluminium can reduce $M g O$ .

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 :

A is correct R is not correct.

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

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A is not correct, R is correct.

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

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Solution

The correct option is B Both A and R are correct, but R is NOT the correct explanation of A.
Magnesium can reduce $A l_{2} O_{3}$ at a temperature below $1350^{\circ} C$ while above $1350^{\circ} C$ aluminium can reduce $M g O$ because below $1350^{\circ} C$ $Δ G$ of $M g O$ (formation) is more negative and above $1350^{\circ} C$ $Δ G$ of $A l_{2} O_{3}$ (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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