(B) The correct answer is $B$. In the periodic table,the first ionization enthalpy generally increases from left to right across a period. However,due

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$B$. $B < C < N < O$ : Increasing first ionization enthalpy

(B) The correct answer is $B$. In the periodic table,the first ionization enthalpy generally increases from left to right across a period. However,due to the stable half-filled $2p^3$ configuration of Nitrogen $(N)$,its first ionization enthalpy is higher than that of Oxygen $(O)$. Therefore,the correct order is $B < C < O < N$,making the given order $B < C < N < O$ incorrect.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Mix Examples - Classification of Elements and Periodicity in Properties

Medium

In which of the following arrangements is the order $NOT$ according to the property indicated against it?

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A
$A$. $Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$ : Increasing ionic size
B
$B$. $B < C < N < O$ : Increasing first ionization enthalpy
C
$C$. $I < Br < F < Cl$ : Increasing electron gain enthalpy (with negative sign)
D
$D$. $Li < Na < K < Rb$ : Increasing metallic radius