Given below are two statements : one is labelled as Assertion and the other is labelled as Reason.

Assertion: The ionic radii of ${\mathrm{O}}^{2-}$ and ${\mathrm{Mg}}^{2+}$ are same.

Reason: Both ${\mathrm{O}}^{2-}$ and ${\mathrm{Mg}}^{2+}$ are isoelectronic species.

In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements. One is labelled as
Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.
Assertion $\mathrm{A}$ : The first ionization enthalpy for oxygen is lower than that of nitrogen.

Reason $\mathrm{R}$ : The four electrons in $2\mathrm{p}$ orbitals of oxygen experience more electron-electron repulsion.

In the light of the above statements, choose the correct answer from the options given below.

The total number of acidic oxides from the following list is:

$\mathrm{NO}, {\mathrm{N}}_2\mathrm{O}, {\mathrm{B}}_2{\mathrm{O}}_3,{ \mathrm{N}}_2{\mathrm{O}}_5, \mathrm{CO}, {\mathrm{SO}}_3, {\mathrm{P}}_4{\mathrm{O}}_{10}$

Given two statements below :

Statement I : In ${\mathrm{Cl}}_2$ molecule the covalent radius is double of the atomic radius of chlorine.

Statement II : Radius of anionic species is always greater than their parent atomic radius.

Choose the most appropriate answer from options given below