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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 ${Al}_{2} O_{3}$ at a temperature below 1350^oC, while above 1350^oC 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 :

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

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

A is correct R is not correct.

A is not correct, R is correct.

answer is B.

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Detailed Solution

From Ellingham diagram given in NCERT, it can
be seen that Mg, MgO line crosses Al, Al₂O₃ line
after 1350ºC hence assertion is true.
Yes, Mg have lower MP and BP than aluminium
but it does not explain the above fact

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