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The correct order of ionisation enthalpy...

The correct order of ionisation enthalpy of C, N, O, F is

A

`Clt Olt Nlt F`

B

`C lt N lt O lt F`

C

`F lt N lt C lt O`

D

`F lt O lt N lt C`

Text Solution

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The correct Answer is:
A
On moving from left to right in a period, ionisation energy increase due to increase in effective nuclear charge but electronic configuration of oxygen is unexpectedly lower than that of nitrogen. This is because nitrogen has stable half filled electronic configuration.
N:`1s^(2)2s^(2)2p^(3)`
O: `1s^(2)2s^(2)2p^(4)`
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