Which of the following statements is not corr | vedclass

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Question

(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

Vedclass · Accepted Answer

Electron gain enthalpy of oxygen is greater than that of sulphur

Vedclass · Answer

(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.

Which of the following statements is not correct?

Similar Questions

Which element from the following exhibits a diagonal relationship with $Mg$?

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

Which element among the following is most probable to have the following values?
$\Delta_i H_1 = 419 \ kJ \ mol^{-1}$
$\Delta_i H_2 = 3051 \ kJ \ mol^{-1}$
$\Delta_{eg} H = -48 \ kJ \ mol^{-1}$

Which of the following is not correctly matched?

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