Question

Arrange the following
CO₂, N₂O₅, SiO₂, SO₃ in the order of increasing acidic character.

Answer 1

Explanation:

(a) H2O < SiO2 < CO2 < N2O5 < SO3 (b) H2Te < H2Se < H2S < H2O

Answer 2

Answer: The order of acidic character is SO₃>N₂O5>CO₂>SiO₂

Explanation: For the acidic character in non-metallic oxides :

• Acidic character in non-metallic oxides is directly proportional to the oxidation state of the central atom.
• Acidic character will also depend on the size of the central atom if the oxidation state is the same.

The oxidation state of S in SO₃ is +6, and N in N₂O₅ is +5 but in that of C and Si, the oxidation state is +4. As we go down the group size increases, (Si>C).

The order of acidic character is SO₃>N₂O5>CO₂>SiO₂.