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AP EAMCET202022 Sep 2020Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The correct order comparing the acid strengths of HF , HCl , HBr and HI ?

Options

  1. AHF >> HCl >> HBr >> HI
  2. BHF < < HCl < < HBr < < HI
  3. CHF > HCl >> HBr >> HI
  4. DHF > HBr >> HI

Correct answer

B. HF < < HCl < < HBr < < HI

Step-by-step solution

Down the group the electronegativity decreases and the size increases. Thus, it becomes easy to lose H ⁺ ion. This causes the increase in acidic strength down the group. Thus, the correct order is HF < < HCI < < HBr < < HI .

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