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NEET2013ChemistryClassification of Elements and Periodicity in PropertiesActual

The first ionisation enthalpy of Na , Mg and Si are 496,737,776 ~kJ / mol respectively. What will be the first ionisation enthalpy potential of Al in kJ / mol ?

Options

  1. A>766 ~kJ / mol
  2. B>496 and < 737 ~kJ
  3. C>737 and < 766 ~kJ / mol
  4. D>496 ~kJ / mol

Correct answer

B. >496 and < 737 ~kJ

Step-by-step solution

The ionisation enthalpy of Al is lower than that of Mg as 3 p^1 electron of Al is easier to remove than to remove an electron from 3s-orbital of Mg fully-filled.

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