Which of the following is the weakest reducing agent ?
Correct answer: A. HF
- A. HF
- B. HBr
- C. HC
- D. HI
Explanation
The reducing strength of hydrogen halides increases down the group because the H-X bond becomes weaker, making the halide ion more willing to donate electrons. The H-F bond is exceptionally strong, so HF is the weakest reducing agent. Students often choose HI by confusing reducing strength with acid strength, since HI is the strongest hydrogen halide acid.
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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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