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AP EAMCET202022 Sep 2020Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Arrange L I , Be , B and C in decreasing order of their first ionisation enthalpies.

Options

  1. ALi > B > Be > C
  2. BC > Li > Be > B
  3. CC > Be > B > Li
  4. DC > B > Be > Li

Correct answer

C. C > Be > B > Li

Step-by-step solution

As we go from left to right in period the ionisation potential increases but Be and B are exception as the Be has 1 s^2, 2 s^2 and boron has 1 s^2, 2 s^2, 2 p^1 so it's easy to remove electron from boron than berylium decreasing order of their first ionisation enthalpies. C > Be > B > Li So, option (3) is correct.

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