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KCET2023ChemistryClassification of Elements and Periodicity in Properties

The correct order of first ionisation enthalpy of given elements is

Options

  1. ALi < B < Be < C
  2. BBe < Li < B < C
  3. CC < B < Be < Li
  4. DLi < Be < B < C

Correct answer

A. Li < B < Be < C

Step-by-step solution

Ionisation enthalpy of elements generally increases on going from left to right along a period. But Be nane half-filled electronic configuration which requires more energy to ionise as compare to B . Thus, the correct order will be Li < B < Be < C .

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