Match the following oxides with their nature:

**Column I**
(a) CO
(b) BaO
(c) Al₂O₃
(d) Cl₂O₇

**Column II**

Question

Match the following oxides with their nature:

**Column I**
(a) CO
(b) BaO
(c) Al₂O₃
(d) Cl₂O₇

**Column II**
(i) Basic
(ii) Neutral
(iii) Acidic
(iv) Amphoteric

Accepted Answer

1. **Analyze CO (Carbon Monoxide):** It is a non-metal oxide that does not react with acids or bases to form salts. Hence, it is **Neutral** (matches ii).
2. **Analyze BaO (Barium Oxide):** Barium is a Group 2 alkali earth metal. Metal oxides, especially of electropositive elements, are **Basic** (matches i).
3. **Analyze Al₂O₃ (Aluminium Oxide):** Aluminium oxide reacts with both acids (forming aluminium salts) and bases (forming aluminates). Hence, it is **Amphoteric** (matches iv).
4. **Analyze Cl₂O₇ (Dichlorine Heptoxide):** Chlorine is a non-metal in a high oxidation state (+7). Non-metal oxides are generally acidic, and high oxidation states enhance acidity. It dissolves in water to form perchloric acid. Hence, it is **Acidic** (matches iii).
5. **Conclusion:** The correct sequence is a-ii, b-i, c-iv, d-iii.

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