`{:("Column A","Column B"),(a. Na_2O ,"i. Amphoteric oxide"),(b. Cl_2O_7 ,"ii. Acidic oxide"),(c. Al_2O_3,"iii. Neutral oxide"),(d. CO,"iv. Basix oxide"):}`

Answer

To solve the problem of matching the compounds in Column A with their corresponding types in Column B, we will analyze each compound based on its chemical properties.

### Step-by-Step Solution:

1. **Identify Na₂O:**
- Sodium oxide (Na₂O) is formed from sodium, which is a metal.
- Metal oxides are generally basic in nature.
- **Conclusion:** Na₂O is a basic oxide.
- **Match:** (a) Na₂O → (iv) Basic oxide.

2. **Identify Cl₂O₇:**
- Dichlorine heptoxide (Cl₂O₇) is formed from chlorine, which is a non-metal.
- Non-metal oxides are typically acidic.
- **Conclusion:** Cl₂O₇ is an acidic oxide.
- **Match:** (b) Cl₂O₇ → (ii) Acidic oxide.

3. **Identify Al₂O₃:**
- Aluminum oxide (Al₂O₃) has properties of both acids and bases.
- It can react with acids to form salts and with bases to form complex ions, indicating that it is amphoteric.
- **Conclusion:** Al₂O₃ is an amphoteric oxide.
- **Match:** (c) Al₂O₃ → (i) Amphoteric oxide.

4. **Identify CO:**
- Carbon monoxide (CO) does not exhibit acidic or basic properties; it is neutral.
- It does not react with acids or bases in a way that would classify it as either.
- **Conclusion:** CO is a neutral oxide.
- **Match:** (d) CO → (iii) Neutral oxide.

### Final Matches:
- (a) Na₂O → (iv) Basic oxide
- (b) Cl₂O₇ → (ii) Acidic oxide
- (c) Al₂O₃ → (i) Amphoteric oxide
- (d) CO → (iii) Neutral oxide

### Summary of Matches:
- A: Na₂O → iv: Basic oxide
- B: Cl₂O₇ → ii: Acidic oxide
- C: Al₂O₃ → i: Amphoteric oxide
- D: CO → iii: Neutral oxide

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