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COMEDK2017ChemistryClassification of Elements and Periodicity in Properties

The correct order in which the first ionisation potential increases is

Options

  1. ANa , K , Be
  2. BK , Na , Be
  3. CK, Be, Na
  4. DBe, Na, K

Correct answer

B. K , Na , Be

Step-by-step solution

The correct order in which first ionisation potential (IP) increases is K , Na , Be. On going down the group IP decreases while on going left to right IP increases.

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