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NEET 2005
Exam
NEET
Year
2005
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

NEET 2005 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The correct order of acid strength is:

The correct order of acid strength is:The correct order of acid strength is:

Options

  1. AHClO4<HClO3<HClO2<HClO\mathrm{HClO}_4 < \mathrm{HClO}_3 < \mathrm{HClO}_2 < \mathrm{HClO}
  2. BHClO<HClO2<HClO3<HClO4\mathrm{HClO} < \mathrm{HClO}_2 < \mathrm{HClO}_3 < \mathrm{HClO}_4
  3. CHClO4<HClO2<HClO2<HClO3\mathrm{HClO}_4 < \mathrm{HClO}^2 < \mathrm{HClO}_2 < \mathrm{HClO}_3
  4. DHClO2<HClO3<HClO4<HClO\mathrm{HClO}_2 < \mathrm{HClO}_3 < \mathrm{HClO}_4 < \mathrm{HClO}

Correct answer

B. HClO<HClO2<HClO3<HClO4\mathrm{HClO} < \mathrm{HClO}_2 < \mathrm{HClO}_3 < \mathrm{HClO}_4

Step-by-step solution

Oxygen is more electronegative than chlorine. With an increase in the number of O\mathrm{O} atoms attached to Cl\mathrm{Cl}, more electrons are pulled away from O−H\mathrm{O}-\mathrm{H} bond and weaker becomes the O−H\mathrm{O}-\mathrm{H} bond. This increases the acid strength. The decreasing order of acidic strength is HClO<HClO2<\mathrm{HClO} < \mathrm{HClO}_2 < HClO3<HClO4\mathrm{HClO}_3 < \mathrm{HClO}_4The correct order of acid strength is:
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