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NEET2001Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which of the following hydrogen halides is most basic?

Options

  1. AHF
  2. BHCl
  3. CHBr
  4. DHI

Correct answer

A. HF

Step-by-step solution

The bond strength H -X decreases from HF to HI. Thus HF is the most stable and hence weakest acid while is least stable and most acidic. In aqueous solutions, HF is only slightly ionised but HCl , HBr and HI are almost completely ionised. As basicity is the reverse of acidity. Therefore, HF is the most basic of all H -X .

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