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Q.

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are:

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a

496, 577, 737, 786

b

786, 737, 577, 496

c

496, 737, 577, 786

d

496, 577, 786, 737

answer is C.

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Detailed Solution

Ionisation energy of Al is less than both Mg and Si. So the order is 496,737,577,786.
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