Question

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:

• A. \( \text{Na}_2\text{O}, \text{K}_2\text{O}, \text{Al}_2\text{O}_3 \) and \( \text{As}_2\text{O}_3 \)
• B. \( \text{Al}_2\text{O}_3, \text{As}_2\text{O}_3, \text{CO} \) and \( \text{NO} \)
• C. \( \text{K}_2\text{O}, \text{Cl}_2\text{O}_7, \text{As}_2\text{O}_3 \) and \( \text{NO} \)
• D. \( \text{Na}_2\text{O}, \text{Al}_2\text{O}_3 \) and \( \text{CO} \)

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Oxides are classified based on their acid-base characteristics:
- Basic: Typically metal oxides of groups 1 & 2 (e.g., \(\text{Na}_2\text{O}\), \(\text{K}_2\text{O}\)).
- Acidic: Typically non-metal oxides with high oxidation states (e.g., \(\text{Cl}_2\text{O}_7\), \(\text{SO}_3\)).
- Amphoteric: Certain metal/metalloid oxides that react with both acids and bases (e.g., \(\text{Al}_2\text{O}_3\), \(\text{ZnO}\), \(\text{As}_2\text{O}_3\)).
- Neutral: Non-metal oxides that react with neither (strictly \(\text{CO}\), \(\text{NO}\), \(\text{N}_2\text{O}\)).
Step 2: Key Formula or Approach:
We must systematically evaluate each option to find the one containing exactly one of each class.
Step 3: Detailed Explanation:
Let's analyze the options:
Option (A): \(\text{Na}_2\text{O}\) (Basic), \(\text{K}_2\text{O}\) (Basic), \(\text{Al}_2\text{O}_3\) (Amphoteric), \(\text{As}_2\text{O}_3\) (Amphoteric).
*Result: Missing Acidic and Neutral oxides.*
Option (B): \(\text{Al}_2\text{O}_3\) (Amphoteric), \(\text{As}_2\text{O}_3\) (Amphoteric), \(\text{CO}\) (Neutral), \(\text{NO}\) (Neutral).
*Result: Missing Basic and Acidic oxides.*
Option (C): \(\text{K}_2\text{O}\) (Basic), \(\text{Cl}_2\text{O}_7\) (Acidic), \(\text{As}_2\text{O}_3\) (Amphoteric), \(\text{NO}\) (Neutral).
*Result: Contains exactly one of each kind!*
Option (D): \(\text{Na}_2\text{O}\) (Basic), \(\text{N}_2\text{O}\) (Neutral), \(\text{Al}_2\text{O}_3\) (Amphoteric), \(\text{CO}\) (Neutral).
*Result: Missing Acidic oxides.*
Step 4: Final Answer:
The correct set is \(\text{K}_2\text{O}\), \(\text{Cl}_2\text{O}_7\), \(\text{As}_2\text{O}_3\) and \(\text{NO}\).