Which one of the following is the weakest acid in water__________________?
Correct answer: A. HF
- A. HF
- B. HCI
- C. HBr
- D. HI
Explanation
HF is the weakest acid in water among these hydrogen halides because the H-F bond is exceptionally strong and does not break readily. Although fluorine is highly electronegative, the acid strength of hydrogen halides down the group is mainly controlled by bond strength, giving HF < HCl < HBr < HI. Students often choose HCl because they remember that hydrochloric acid is a strong acid without comparing it with the other hydrogen halides.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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