Question detail
Which halogen is the least effective oxidising agent?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 7(17), the halogens
Question
- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Iodine
Answer
Iodine
Explanation
Iodine is the least effective oxidising agent among the halogens because it has the lowest electronegativity and largest atomic size, making it less capable of gaining electrons.
Common mistake
Oxidising Ability Confusion
Students often confuse the trend in oxidising ability of halogens with their reactivity, thinking that more reactive halogens are always stronger oxidising agents.
To clarify, remember that oxidising ability increases up the group, while reactivity increases down the group. For example, fluorine is the most reactive but not the strongest oxidising agent compared to chlorine. Focus on the definition of oxidising ability as the tendency to gain electrons.
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