Seema Saini Solutions for Chapter: Periodic Classification of Elements and General Inorganic Chemistry, Exercise 4: DPP

The amount of energy released when ${10}^{12}$ atoms of $\mathrm{Cl}$ vapours are converted into ${\mathrm{Cl}}^{-}$ ions according to the equation $\mathrm{Cl} \left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{Cl}}_{}^{-} \left(\mathrm{g}\right)$ is $58\times {10}^{-10} \mathrm{J}$. Calculate ${\mathrm{\Delta }}_{\mathrm{eg}}\mathrm{H}$ of $\mathrm{Cl}$ atom in $\mathrm{kJ} {\mathrm{mol}}^{-1}$ or $\mathrm{eV} {\mathrm{atom}}^{-1}$.

Arrange the elements with the following electronic configuration of valence electron in the decreasing order of ${\mathrm{\Delta }}_{\mathrm{eg}}{\mathrm{H}}^{\mathrm{\Theta }}$.

(A) $3{\mathrm{s}}^{2}3{\mathrm{p}}^4$ (B) $2{\mathrm{s}}^{2}2{\mathrm{p}}^4$ (C) $2{\mathrm{s}}^{2}2{\mathrm{p}}^3$ (D) $2{\mathrm{s}}^{2}2{\mathrm{p}}^5$

Which of the following orders for electron affinity is/are correct?

Select the equations having endothermic step:

Which of the following represents the correct order of electron affinities?

The $\mathrm{EA}$ values of elements depend on which of the following?

Considering the elements $\mathrm{F}, \mathrm{Cl}, \mathrm{O}$ and $\mathrm{S}$, the correct order of their electron affinity value is:

The amount of energy released when a neutral isolated gaseous atom accepts an electron to form gaseous anion is called electron
affinity.

${\mathrm{O}}_{\left(\mathrm{g}\right)}+e^{\ominus }\stackrel{\mathrm{Exothermic}}{⟶}{\mathrm{O}}_{\left(\mathrm{g}\right)}^{\ominus }$  .... (i)

${\mathrm{O}}_{\left(\mathrm{g}\right)}^{\ominus }+e^{\ominus }\stackrel{ \mathrm{Endothermic}}{⟶}{\mathrm{O}}_{\left(\mathrm{g}\right)}^{2-}$ .... (ii)

In (2) the energy has to be supplied for addition of second electron due to repulsion between an anion and extra electron. The members of third period have higher electron affinity value than members of second period.

Which process involves the maximum release of energy?