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CGP EDU Academic Team
Published on: August 13, 2026
First ionisation enthalpy of Al is lower than that of Mg. this is because.
A
The size of Al is bigger than Mg.
B
Ionisation enthalpy decreases in a period from left to right
C
It is easier to remove electon from unpaired 
than from paired 
than from paired
D
Aluminium is a passive metal while magnesium is active.
Text Solution
Verified by ExpertsThe correct answer is:
C
Electronic configuration of 
Electronic configuration of 
It is difficult to remove electron from paired 
- orbital than unpaired 
Hence, I.E. of Al is lower than Mg.
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