Question:

Which of the following is the correct order of acidic strength for the following compounds: HNO\(_3\), HClO\(_4\), and HClO\(_3\)?

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For oxyacids, the acidic strength generally increases with the number of oxygen atoms attached to the central atom and the electronegativity of the central atom. 

Updated On: Mar 24, 2025
  • HClO4 > HNO3 > HClO3
  • HNO3 > HClO3 > HClO4
  • HClO3 > HNO3 > HClO4
  • HClO4 > HClO3 > HNO3
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The Correct Option is A

Solution and Explanation

The acidity of oxyacids like HNO3, HClO4, and HClO3 depends on the electronegativity of the central atom and the number of oxygen atoms attached to it. The greater the number of oxygen atoms and the higher the electronegativity of the central atom, the stronger the acid.
  • HClO4 is the strongest acid because chlorine is highly electronegative and has the most oxygen atoms attached to it.
  • HNO3 is stronger than HClO3 because the nitrogen atom is more electronegative than chlorine, and nitric acid has more oxygen atoms than chlorous acid.
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