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JEE Main20244 Apr 2024Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of the first ionization enthalpy is

Options

  1. A( Al > Ga > Tl )
  2. B( Ga > Al > B )
  3. C( Tl > Ga > Al )
  4. D( B > Al > Ga )

Correct answer

C. ( Tl > Ga > Al )

Step-by-step solution

(i) due to lanthanide contraction T has more I.E. as compared to Ga and A (ii) due to scandide contraction Ga has more I.E. as compared to A

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