Which of the following statements are correct? A. The process of the addition an electron to a neutral gaseous atom is always exothermic B. The process of removing an electron from an isolated gaseous atom is always endothermic C. The $1^{ ext {st }}$ ionization energy of the boron is less than…

Question

Which of the following statements are correct?
A. The process of the addition an electron to a neutral gaseous atom is always exothermic
B. The process of removing an electron from an isolated gaseous atom is always endothermic
C. The $1^{\text {st }}$ ionization energy of the boron is less than that of the beryllium
D. The electronegativity of C is 2.5 in $\mathrm{CH}_4$ and $\mathrm{CCl}_4$
E. Li is the most electropositive among elements of group I
Choose the correct answer from the options gives below

Aicharya · Accepted Answer

(A) The process of adding an $\mathrm{e}^{-}$to a neutral gaseous atom is not always exothermic it may be exothermic or endothermic.
(C) $\mathrm{Be} \quad \mathrm{B}$
$1 s^2 2 s^2 \quad 1 s^2 2 s^2 2 p^1$
In Be 2 s subshell in fully filled
So, need high energy to remove $\mathrm{e}^{-}$as compared to B.
(D)

due to partially positive charge $z_{\text {eff }} \uparrow, \mathrm{EN} \uparrow$
So, EN of $\mathrm{C} \Rightarrow \mathrm{CCl}_4 \gt \mathrm{CH}_4$
(E) Cs is most electropositive.

Which of the following statements are correct? A. The process of the addition an electron to a neutral…

Solution