Which one of the following is an incorrect statement?

The ionisation potential of nitrogen is greater than that of chlorine

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The electron affinity of fluorine is greater than that of chlorine

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The ionisation potential of beryllium is greater than that of boron

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The electronegativity of fluorine is greater than that of chlorine

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Solution

The correct option is B The electron affinity of fluorine is greater than that of chlorine
(A) $I . P . o f N > I . P . o f C l$ due to half filled configuration of $N$ .
(B) $E . A . o f C l > E . A . o f F$ due to high $e - e^{-}$ repulsion in $F$ .
(C) $I . P . o f B e > I . P . o f B$ due to filled $n s^{2}$ configuration of $B e$ .
(D) $E . N . o f F > E . N . o f C l$ .

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N H_{3}

N F_{3}

F^{-}

C l^{-}

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