Question

Statement I: Of the following set of oxides \([Al_2O_3, Cr_2O_3] : [CO, N_2O] ; [Na_2O, V_2O_3] ; [Cl_2O_7, Mn_2O_7]\), the number of sets having the same nature of oxides (basic, acidic, neutral or amphoteric) are 4.
Statement II: Of the given oxides \(Na_2O, Al_2O_3, CO, Cl_2O_7\), the most basic and acidic oxides are \(Na_2O\) and \(Cl_2O_7\).
Which of the following options is correct?
(A) Both Statement I and Statement II are correct.
(B) Statement I is correct, but Statement II is incorrect.
(C) Statement I is incorrect, but Statement II is correct.
(D) Both Statement I and Statement II are incorrect.

Hint:

Amphoteric oxides can act both as acids and bases, neutral oxides do not show acidic or basic properties, basic oxides react with acids, and acidic oxides react with bases.

Answer 1

Correct Answer: 1

Step 1: Analyze Statement I.
Let's examine each set of oxides:
- \([Al_2O_3, Cr_2O_3]\): These are amphoteric oxides (both can react as acid or base depending on the conditions).
- \([CO, N_2O]\): These are neutral oxides (do not behave as acids or bases).
- \([Na_2O, V_2O_3]\): \(Na_2O\) is a basic oxide, while \(V_2O_3\) is amphoteric.
- \([Cl_2O_7, Mn_2O_7]\): \(Cl_2O_7\) is an acidic oxide, and \(Mn_2O_7\) is also acidic.
Thus, the number of sets having the same nature of oxides is: 4 (1st, 3rd, and 4th sets are of the same nature; the 2nd set is neutral).
Hence, Statement I is correct.

Step 2: Analyze Statement II.
- \(Na_2O\) is a highly basic oxide.
- \(Cl_2O_7\) is a highly acidic oxide (due to chlorine's high electronegativity and the presence of oxygen).
Thus, the most basic oxide is \(Na_2O\), and the most acidic oxide is \(Cl_2O_7\).
Hence, Statement II is correct.

Step 3: Conclusion.
Both Statement I and Statement II are correct.
The correct answer is:
\[ \boxed{1} \]