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Q.

First ionisation potential of magnesium is greater than that of aluminium because

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a

Aluminium atom is very large when compared to Magnesium atom

b

Aluminium has a stable electronic configuration

c

Magnesium has a stable electronic configuration

d

The electron affinity of Magnesium is positive (energy is absorbed)

answer is C.

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Detailed Solution

Mg(Z=12)...[Ne]3s2Al(Z=13)...[Ne]3s23p1"Mg" has completely filled 3s orbital (symmetrical configuration) leading to stability
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