Name the various kind of oxides and mention their properties.

Oxides are of three types:

(i) Acidic oxides.
(ii) Basic or metallic oxides.
(iii) Amphoteric oxides.

(i) Acidic oxides: These oxides on treatment with water form acids, e.g., CO₂, SO₂, etc.
CO₂ + H₂O → H₂CO₃
SO₂ + H₂O → H₂SO₃

Properties:
1. Do not react with acids.
2. React with bases and alkalis to form salt & water.
3. Dissolve in water to form acidic solutions.
4. Usually gases at room temp.

(ii) Basic or metallic oxides: The oxides which on treatment with water form alkalies are known as basic oxides. Metallic oxides are generally basic oxides. Such oxides turn red litmus blue, e.g., Na₂O, MgO, etc.
Na₂O + H₂O → 2NaOH
MgO + 2H₂O → Mg(OH)₂

Propertes:
1. Do not react with bases.
2. React with acids to form salt & water.
3. Basic Oxides are usually insoluble in water. Those that dissolve in water forms alkaline solutions.

(iii) Amphoteric oxides: The oxides which show the properties of both acidic and basic oxides are known as amphoteric oxides, e.g., Al₂O₃, SiO₂ etc.

Properties:
1. React with both acids and bases to form salt & water