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Question

Increasing order of acid strength of halogen acid is

  1. H F less than H C l less than H B r less than H I  
  2. H C l less than H B r less than H I less than H F  
  3. H F less than H I less than H B r less than H C l  
  4. None of these  

The correct answer is: H F less than H C l less than H B r less than H I


    As going down the group size increases, an liberation of H to the power of plus end exponent ion becomes easy. So the order of acidity is : H I greater than H B r greater than H C l greater than H F

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