Multiple choice

Correct order of increasing values of second ionisation potential of C, N, O and F is

  1. C < N < O < F

  2. C < O < N < F

  3. C < N < F < O

  4. O < N < F < C

  5. F < O < N < C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The second ionisation potential means energy required for removal of electron from following cations: C+ (5e) = 1s2, 2s2, 2p1 N+ (6e) = 1s2, 2s2, 2p2 O+ (7e) = 1s2, 2s2, 2p3 F+ (8e) = 1s2, 2s2, 2p4 Therefore, order of increasing second ionisation potential is C < N < F < O.

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