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°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:
Select the correct option:
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
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
From Ellingham diagram given in NCERT, it can be seen that Mg, MgO line crosses Al, $\mathrm{Al}_2 \mathrm{O}_3$ 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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