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Question

The second ionization potentials in electron volts of oxygen and fluorine atoms are respectively given by -


A

35.1., 38.3

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B

38.3, 38.3

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C

38.3, 35.1

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D

35.1, 35.1

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Solution

The correct option is C

38.3, 35.1


Second ionisation potential is the energy required to remove an electron from unipositively charged ion

0 E.C 1 s2 2 s2 2 p4 O+ - 1 s2 2 s2 2 s3

F E.C 1 s2 2 s2 2 p5 F+ - 1 s2 2 s2 2 p4

0 O+ I.P2 F F+ I.P2

0 O+2 I.P2 I+ I+2 I.P2

I.P1 of F > O as fluorine has less atomic size compared to O.

I.P2 of O > F as O+ has filled P- sub shell.


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