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:

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?

(A) $\mathrm{Rb}$ and $\mathrm{Cs}$

(B) $\mathrm{Na}$ and $\mathrm{K}$

(C) $\mathrm{Ar}$ and $\mathrm{Kr}$

(D) $\mathrm{I}$ and $\mathrm{At}$

Choose the correct answer from the options given below:

The difference between electron gain enthalpies will be maximum between :

What is the correct oder of electron gain enthalpy of $\mathrm{Cl}, \mathrm{F}, \mathrm{Te}, \mathrm{Po}$

Arrange the following according to the instruction given in bracket:

$\mathrm{F}, \mathrm{B}, \mathrm{N}, \mathrm{O}$ (In the increasing order of electron affinity)

Which of the following reactions does not involve absorption of energy?

I. $\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{-}\left(\mathrm{g}\right)$

II. $\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{S}}^{-}\left(\mathrm{g}\right)$

III. ${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{2-}\left(\mathrm{g}\right)$

IV. $\mathrm{Cl}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{Cl}}^{-}\left(\mathrm{g}\right)$