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Question

The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is (J1981,1M)

A
C > N > O > F
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B
O > N > F > C
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C
O > F > N > C
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D
F > O > N > C
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Solution

The correct option is C O > F > N > C
For second ionisation potential, electron will have to be removed from valence shell of the following ions:

In general, ionsiation energy increases from left to right in a period. However, exception occur between adjacent atoms in a period, greater amount energy is required for removal of electron from completely half -filled or completerly filled orbital than the same for adjacent atom with either less than completely half-filled or less than completely filled orbital. Therefore, ionisation potential of O+ is greater than that of F+. Also ionisation potential of N+ is greater than C+ but less than both O+ and F+ (periodic trend). Hence overall order is 2nd IP : O > F> N > C.

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