Question:

Which one of the following is the most acidic?

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In general, oxides of non-metals are acidic, while oxides of metals are basic or amphoteric. For non-metals, the acidity increases as we move from left to right across the periodic table.
Updated On: Apr 6, 2025
  • Na\(_2\)O
  • Al\(_2\)O\(_3\)
  • CaO
  • Cl\(_2\)O\(_7\)
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The Correct Option is D

Solution and Explanation

To determine which oxide is the most acidic, we look at the oxides of metals and non-metals. Oxides of non-metals (like Cl\(_2\)O\(_7\)) are generally acidic, while oxides of metals tend to be basic.
- Na\(_2\)O and CaO are basic oxides of metals.
- Al\(_2\)O\(_3\) is amphoteric, meaning it can act as either an acid or a base depending on the conditions.
- Cl\(_2\)O\(_7\) is an acidic oxide and is the strongest acid among the options. It reacts vigorously with water to form acids.
Thus, Cl\(_2\)O\(_7\) is the most acidic oxide.
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