Oxides Of Period 3
Across the third period, the acidic character of highest oxides generally increases. Which sequence is correct?
Select the correct option:
Solution
Na2O < MgO < Al2O3 < SiO2 < P4O10 < SO3 < Cl2O7
Metallic character decreases from Na to Cl across period 3, and non-metallic character increases. Therefore oxides shift from strongly basic (Na2O, MgO) to amphoteric (Al2O3) and then acidic (SiO2 onward). Among non-metal oxides, acidity rises with oxidation state and electronegativity, giving the shown increasing order.
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- oxides of period 3
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Na2O < MgO < Al2O3 < SiO2 < P4O10 < SO3 < Cl2O7
Metallic character decreases from Na to Cl across period 3, and non-metallic character increases. Therefore oxides shift from strongly basic (Na2O, MgO) to amphoteric (Al2O3) and then acidic (SiO2 onward). Among non-metal oxides, acidity rises with oxidation state and electronegativity, giving the shown increasing order.
This medium difficulty chemistry question is from the chapter p-block elements, covering the topic of oxides of period 3. It appeared in the 2025 exam.
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