Given below are two statements:

$$\textbf{Statement I :}$$ The number of pairs among $$[\text{Al}_2\text{O}_3, \text{Cr}_2\text{O}_3]$$, $$[\text{Cl}_2\text{O}_7, \text{Mn}_2\text{O}_7]$$, $$[\text{Na}_2\text{O}, \text{V}_2\text{O}_3]$$ and $$[\text{CO}, \text{N}_2\text{O}]$$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4.

$$\textbf{Statement II :}$$ Among $$\text{Na}_2\text{O}$$, $$\text{Al}_2\text{O}_3$$, $$\text{CO}$$ and $$\text{Cl}_2\text{O}_7$$, the most basic and acidic oxides are $$\text{Na}_2\text{O}$$ and $$\text{Cl}_2\text{O}_7$$, respectively.

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

For any main-group or transition element, the acidic character of its oxide increases as the oxidation state of the element rises and/or the metallic character of the element decreases. Conversely, oxides of highly electropositive metals are strongly basic, and the very few oxides whose molecules contain non-polar $$E\!-\!O$$ bonds are neutral.

Case 1: $$[\text{Al}_2\text{O}_3,\; \text{Cr}_2\text{O}_3]$$
Both aluminium and chromium are in the $$+3$$ oxidation state. The oxides dissolve in both acids and bases to give salts, so they are amphoteric.

Case 2: $$[\text{Cl}_2\text{O}_7,\; \text{Mn}_2\text{O}_7]$$
Chlorine is in the $$+7$$ state and manganese is also in the $$+7$$ state. Such very high oxidation states yield strongly acidic anhydrides (they form $$\mathrm{HClO_4}$$ and $$\mathrm{HMnO_4}$$ in water). Hence both oxides are acidic.

Case 3: $$[\text{Na}_2\text{O},\; \text{V}_2\text{O}_3]$$
$$\text{Na}_2\text{O}$$ is the oxide of an alkali metal and is vigorously basic. $$\text{V}_2\text{O}_3$$ contains vanadium in the low oxidation state $$+3$$; such oxides of early transition metals behave as basic oxides. Thus both members of this pair are basic.

Case 4: $$[\text{CO},\; \text{N}_2\text{O}]$$
Neither carbon nor nitrogen in these compounds permits formation of $$OH^-$$ or $$H^+$$ in water; the oxides are essentially inert toward both acids and bases. Therefore, $$\text{CO}$$ and $$\text{N}_2\text{O}$$ are neutral oxides.

Every one of the four pairs contains oxides of the same nature (amphoteric, acidic, basic, neutral respectively). Hence the count asked for in Statement I is indeed $$4$$.

Among the set $$\{\text{Na}_2\text{O},\, \text{Al}_2\text{O}_3,\, \text{CO},\, \text{Cl}_2\text{O}_7\}$$:
• $$\text{Na}_2\text{O}$$, an alkali-metal oxide, is the strongest base.
• $$\text{Cl}_2\text{O}_7$$, the oxide of chlorine in its highest oxidation state $$+7$$, is the strongest acid anhydride.
Therefore Statement II is also correct.

Both statements are true.

Option A which is: Both statements are true