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Question 600213
JEE Chemistry · Hard

Atomic Structure: Ionisation Energy MCQ

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Ionisation EnergyHardQuestion 600213

Question

The first ionisation energy of Li is 5.4 eV. The energy needed to remove the electron from Li²⁺ (hydrogen-like, Z=3) from n=1 is:
  1. A
    13.6 eV
  2. B
    30.6 eV
  3. C
    122.4 eV
    Correct
  4. D
    54.4 eV

Correct answer

122.4 eV

Explanation

IE of H-like Li²⁺ = 13.6×Z²/n² = 13.6×9/1 = 122.4 eV.

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