Question

Select the incorrect statement(s).

• A. $I{E}_1$ of Nitrogen atom is less than $I{E}_1$ of Oxygen atom.
  
• B. Electron gain enthalpy of Oxygen is less negative than Selenium.
  
• C. Electronegativity on Pauling scale is 2.8 times the electronegativity on Mulliken scale.
  
• D. $C{r}^{6+}$ is smaller than $C{r}^{3+}$.
  

Answer 1

Answer: (A), (C)

The correct options are
A $I{E}_1$ of Nitrogen atom is less than $I{E}_1$ of Oxygen atom.

C Electronegativity on Pauling scale is 2.8 times the electronegativity on Mulliken scale.


(A,C)
(A) $I{E}_1$of $N$ is more than $O$ due to stable half filled electronic configuration of valence shell in $N$.
(B) Electron gain enthalpy of $O$ (-141 kJ$mo{l}^{-1}$) is less than Sulphur and Selenium due to its exceptionally small atomic size.
(C) Electronegativity on mulliken scale is 2.8 times larger than electronegativity on pauling scale.
(D) The ionic radius decreases as more electrons are ionized off/removed.