Ionization enthalpy of elements of 13th group

Ionization enthalpy of elements of 13th group

  1. A

    decreases from B to Al

  2. B

    very close for Al and Ga

  3. C

    slightly increases from In to Tl

  4. D

    all of these

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    Solution:

     Ionisation energies order B > Tl >Ga >Al >In

    Ga  IE =579KJ/mol  and Al  IE =577KJ/mol almost same

    High IE for Tl is due to inert pair effect

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