Question

Which among the following is the strongest acid?

• A. HF
• B. HCl
• C. HBr
• D. HI

Answer 1

Answer: (D)

HI

Answer 2

Among hydrogen halides the strongest acid is HI. As the size of halogen increase, bond length increase hence bond energy decreases. So, the HI releases $H ^{\oplus}$ ions easily and show high acidic nature.

The distance between the hydrogen and halogen atoms rises as the anion's size grows. For hydracids, it gets simpler to liberate H + ions as one move down in the halogen group.
So, the order will be HI>HBr>HCl>HF and HI is the strongest among them.

Discover More From This Chapter:Acids and Bases