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JEE Main202225 Jul 2022Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The first ionization enthalpies of Be , B , N and O follow the order

Options

  1. AB < Be < O < N
  2. BO < N < B < Be
  3. CBe < B < N < O
  4. DB < Be < N < O

Correct answer

A. B < Be < O < N

Step-by-step solution

The ionisation enthalpy increases as we go from left to right in a period, while it decreases as we come down a group. So according to this, the order will be Be < B < C < N < O . But there are two exceptions, in the case of Be and N because of the highly stable 2 s 2 (completely filled orbital) and 2 s 2 2 p 3 (half-filled orbital 2 p 3 ) valence configuration. Due to this, the correct order is: B < Be < C < O < N .

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