Which is the strongest acid ?
Correct answer: D. HCIO4
- A. HCIO
- B. HCIO2
- C. HCIO3
- D. HCIO4
Explanation
For chlorine oxyacids, acidity increases with the number of oxygen atoms because additional oxygen atoms withdraw electron density and stabilize the conjugate base. Thus the order is HClO < HClO2 < HClO3 < HClO4, making perchloric acid the strongest. Students may choose HClO because they incorrectly assume fewer atoms mean a more concentrated acid.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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