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a
Mg
b
Mg+
c
Mg2+
d
All the above ions have same I.E
answer is C.
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Detailed Solution
An electron is lost, effective nuclear charge increases, force of attraction increases. Hence, (IE)1<(IE)2<(IE)3Thus,Mg2+has maximum I.E. The other words we can also say that the ion has inert gas configuration, and its difficult to disturb it.