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Difficulty: EasyOxygen, Ozone, and Classification of Oxides

Match each of the following oxides on the left with its correct acid-base classification on the right.

  • Potassium oxide (K2O\text{K}_2\text{O})Basic oxide
  • Sulfur dioxide (SO2\text{SO}_2)Acidic oxide
  • Lead(II) oxide (PbO\text{PbO})Amphoteric oxide
  • Nitrogen(II) oxide (NO\text{NO})Neutral oxide

Answer

Potassium oxide (K2O\text{K}_2\text{O}) matches Basic oxide; Sulfur dioxide (SO2\text{SO}_2) matches Acidic oxide; Lead(II) oxide (PbO\text{PbO}) matches Amphoteric oxide; Nitrogen(II) oxide (NO\text{NO}) matches Neutral oxide.
Potassium oxide is a basic metallic oxide; sulfur dioxide is an acidic non-metal oxide; lead(II) oxide reacts with both acids and alkalis (amphoteric); and nitrogen(II) oxide does not react with either acids or alkalis (neutral).

Step-by-Step Solution

1
Identify the nature of potassium oxide (K2O\text{K}_2\text{O}).
As an alkali metal oxide, it dissolves in water to form potassium hydroxide (KOH\text{KOH}) and reacts with acids to yield salts, classifying it as a basic oxide.
Basic oxides are metallic oxides that neutralize acids.
2
Identify the nature of sulfur dioxide (SO2\text{SO}_2).
It is a covalent non-metal oxide that reacts with alkalis to form trioxosulfate(IV) salts, classifying it as an acidic oxide.
Acidic oxides (acid anhydrides) react with bases or water to yield acidic solutions/salts.
3
Identify the nature of lead(II) oxide (PbO\text{PbO}).
It shows dual reactivity, dissolving in acids like HNO3\text{HNO}_3 and bases like concentrated NaOH\text{NaOH}, classifying it as an amphoteric oxide.
Amphoteric oxides can behave as either acids or bases depending on the reactant.
4
Identify the nature of nitrogen(II) oxide (NO\text{NO}).
It displays no acid-base properties with aqueous acids or bases, classifying it as a neutral oxide.
Neutral oxides do not form salts when treated with acids or alkalis.

Key Concept

Classification of oxides based on acid-base character (basic, acidic, amphoteric, neutral)
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Topics

Oxygen, Ozone, and Classification of Oxides

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