Electron Gain Enthalpy and its Applications

Which of the following statements are not correct?

A. The electron gain enthalpy of $\mathrm{F}$ is more negative than that of $\mathrm{Cl}.$

B. Ionization enthalpy decreases in a group of periodic table.

C. The electronegativity of an atom depends upon the atoms bonded to it.

D. ${\mathrm{Al}}_2{\mathrm{O}}_3$ and $\mathrm{NO}$ are examples of amphoteric oxides.

Choose the most appropriate answer from the options given below:

The difference between electron gain enthalpies will be maximum between :

Which of the following have highest electron gain enthalpy difference.

Find the number of elements having lower ${\mathrm{EA}}_2$ than ${\mathrm{EA}}_1$.

$\mathrm{O}, \mathrm{S}, \mathrm{I}, \mathrm{P}, \mathrm{As}, \mathrm{Si}, \mathrm{Li}, \mathrm{K}$

Among the following, how many processes energy is released?

(a) ${\mathrm{N}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}\to {\mathrm{N}}^{-}$

(b) ${\mathrm{B}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}\to {\mathrm{B}}_{\left(\mathrm{g}\right)}^{-}$

(c) ${\mathrm{O}}^{}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}\to {\mathrm{O}}_{\left(g\right)}^{-}$

(d) ${\mathrm{Mg}}_{\left(\mathrm{g}\right)}^{-}\to {\mathrm{Mg}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}$

(e) $\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{O}}^{+}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}$

(f) ${\mathrm{S}}_{\left(\mathrm{g}\right)}^{-}+{\mathrm{e}}^{-}\to {\mathrm{S}}_{\left(\mathrm{g}\right)}^{2-}$

(g) ${\mathrm{H}}_{\left(\mathrm{g}\right)}^{-}\to {\mathrm{H}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}$

(h) ${\mathrm{O}}_{\left(\mathrm{g}\right)}^{-}+{\mathrm{e}}^{-}\to {\mathrm{O}}_{\left(\mathrm{g}\right)}^{2-}$

(i) ${\mathrm{Mg}}_{\left(\mathrm{g}\right)}^{+}\to {\mathrm{Mg}}^{2+}+{\mathrm{e}}^{-}$

(j) ${\mathrm{P}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-}\to {\mathrm{P}}_{\left(\mathrm{g}\right)}^{-}$

Total number of element which have negative electron gain enthalpy.

$\mathrm{Li},\mathrm{Be},\mathrm{Na},\mathrm{N},\mathrm{Ne},\mathrm{O},\mathrm{Mg},\mathrm{C},\mathrm{P}$

Which of the following represents the exothermic process?

Which of the following represents the exothermic process?

The correct order of electron affinity of $16\mathrm{th}$ group elements is

The electron affinity of bromine is $3.36 \mathrm{eV}$. How much energy in $\mathrm{kcal}$ is released when $8 \mathrm{g}$ of bromine is completely converted to ${\mathrm{Br}}^{-}$ ions in the gaseous state? ($1 \mathrm{eV}=23.06 \mathrm{kcal} {\mathrm{mol}}^{-1}$). (Give the value rounded-off to the nearest integer)

Name the element with maximum electron affinity.

The electronic configuration of four elements I, II, III and IV are given:

I $: 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^5$

II $: 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^4$

III $: 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^5$

IV $:$ $1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^3$

Which element has highest value of $1^{\text{st }}$ Electron gain enthalpy (magnitude):

Correct statement is ?

The formation of the oxide ion ${\mathrm{O}}^{2-}$(g) requires first an exothermic and then an endothermic step as shown below: $\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-1}\to {\mathrm{O}}^{-}\left(\mathrm{g}\right);∆{\mathrm{H}}^0=-142 \mathrm{k}\mathrm{J} \mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$
${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-1}\to {\mathrm{O}}^{2-}\left(\mathrm{g}\right);∆{\mathrm{H}}^0=+844 \mathrm{k}\mathrm{J} \mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$
This is because

Explain periodicity in electron gain enthalpy in a group? 

Which one (atom / ion) in the following pairs has higher electron gain enthalpy?
${\mathrm{N}}^{-}, \mathrm{P}$

Which one (atom / ion) in the following pairs has higher electron gain enthalpy?
${\mathrm{O}}^{-}, {\mathrm{S}}^{-}$

Which one (atom / ion) in the following pairs has higher electron gain enthalpy?
$\mathrm{O}, {\mathrm{S}}^{-}$

Which one (atom / ion) in the following pairs has higher electron gain enthalpy?
 $O^{-},S$ 

Energy will be released in which of the following?