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
