Which of the following statements is not corr | vedclass

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(B) The correct answer is $B$. $(A)$ Nitrogen $(2s^2 2p^3)$ has a stable half-filled $p$-orbital,so its first ionization enthalpy is higher than carbo

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Electron gain enthalpy of oxygen is greater than that of sulphur

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(B) The correct answer is $B$. $(A)$ Nitrogen $(2s^2 2p^3)$ has a stable half-filled $p$-orbital,so its first ionization enthalpy is higher than carbon $(2s^2 2p^2)$. This statement is correct. $(B)$ Electron gain enthalpy of sulphur is more negative than that of oxygen due to the small size of oxygen,which leads to inter-electronic repulsions. Thus,the electron gain enthalpy of oxygen is less than that of sulphur. This statement is incorrect. $(C)$ $Mg^{2+}$ and $Al^{3+}$ are isoelectronic species ($10$ electrons). For isoelectronic species,ionic radius decreases as the nuclear charge increases. Since $Z$ of $Al$ $(13)$ is greater than $Mg$ $(12)$,the radius of $Mg^{2+}$ is greater than $Al^{3+}$. This statement is correct. $(D)$ Electronegativity increases across a period. Fluorine is more electronegative than oxygen. This statement is correct.

List-$I$	List-$II$
$A$. $Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$	$I$. Ionisation Enthalpy
$B$. $B < C < O < N$	$II$. Metallic character
$C$. $B < Al < Mg < K$	$III$. Electronegativity
$D$. $Si < P < S < Cl$	$IV$. Ionic radii

Which of the following statements is not correct?

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