Q97 / 200 · JIPMER 2008 · Chemistry

The set representing the correct order for first ionisation potential is

  • A
    \(\mathrm{K} \gt \mathrm{Na} \gt \mathrm{Li}\)
  • Correct answer
    B
    \(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
  • C
    B \( \gt \) C \( \gt \) N
  • D
    \(\mathrm{Ge} \gt \mathrm{Si} \gt \mathrm{C}\)

Solution

The IP decreases in a group on moving downward because atomic radius increases hence the correct order is : \(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)

Hence, the correct answer is option: 'B'.

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