Question:
Which one of the following is the weakest acid?
Which one of the following is the weakest acid?
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Acid strength of HX increases down the group as bond strength decreases.
Updated On: Apr 23, 2026
- HF
- HCl
- HBr
- HI
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The Correct Option is A
Solution and Explanation
Concept:
Acid strength in hydrogen halides increases down the group due to decrease in bond strength.
Step 1: Bond strength order: \[ HF>HCl>HBr>HI \]
Step 2: Reason: Stronger bond → harder to release H$^+$ → weaker acid.
Step 3: HF has strongest H–F bond. Conclusion:
Thus, HF is the weakest acid.
Step 1: Bond strength order: \[ HF>HCl>HBr>HI \]
Step 2: Reason: Stronger bond → harder to release H$^+$ → weaker acid.
Step 3: HF has strongest H–F bond. Conclusion:
Thus, HF is the weakest acid.
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