Question:
Which of the following halogens combine with dihydrogen at the lowest temperature?
Which of the following halogens combine with dihydrogen at the lowest temperature?
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Higher reactivity means lower activation energy for reaction.
Updated On: Mar 28, 2026
- Iodine
- Fluorine
- Bromine
- Chlorine
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The Correct Option is B
Solution and Explanation
Step 1: Recall reactivity of halogens.
Reactivity of halogens decreases down the group: \[ \text{F}>\text{Cl}>\text{Br}>\text{I} \] Step 2: Reaction with hydrogen.
Fluorine reacts explosively with hydrogen even in the dark and at very low temperatures.
Step 3: Conclusion.
Thus, fluorine combines with dihydrogen at the lowest temperature.
Reactivity of halogens decreases down the group: \[ \text{F}>\text{Cl}>\text{Br}>\text{I} \] Step 2: Reaction with hydrogen.
Fluorine reacts explosively with hydrogen even in the dark and at very low temperatures.
Step 3: Conclusion.
Thus, fluorine combines with dihydrogen at the lowest temperature.
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