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JEE MainChemistryClassification of Elements and Periodicity in Properties

Identify the incorrect statement among the following.

Options

  1. AThe third ionization enthalpy of Al is significantly greater than the third ionization enthalpy of Mg .
  2. BThe second ionization enthalpy of Cu is higher than the second ionization enthalpy of Zn .
  3. CThe second ionization enthalpy of Cr is higher than the second ionization enthalpy of Mn .
  4. DThe first ionization enthalpy of Zn is higher than the first ionization enthalpy of Ga .

Correct answer

A. The third ionization enthalpy of Al is significantly greater than the third ionization enthalpy of Mg .

Step-by-step solution

Let us evaluate each statement by writing the electronic configurations of the relevant atoms and ions. For Mg ( Z=12 ): The configuration is [ Ne ] 3s^2 . After removing two electrons, Mg ²⁺ attains the stable noble gas configuration of Neon ( 1s^2 2s^2 2p^6 ). Removing a third electron requires breaking this highly stable core, so the third ionization enthalpy ( IE₃ ) of Mg is extremely high. For Al ( Z=13 ): The configuration is [ Ne ] 3s^2 3p^1 . After removing two electrons, Al ²⁺ has the configuration [ Ne ]

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