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Q.The first ionization enthalpy of Na, Mg and Si, respectively, are: 496, 737 and 786 kJ mol¹. The first ionization enthalpy (kJ mol¹) of Al is:

( JEE mains 2022)

1. 487

2. 768

3. 577

4.856

Ans:- [c]

I. E: Na < Al < Mg < Si

.. 496 <IE (Al) < 737

Option (C), matches the condition.

i.e IE (Al) = 577 kJmol-¹

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