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Which of the following statements is not true for halogens?

1. All form monobasic oxyacids
2. All are oxidizing agents
3. Chlorine has the highest electron-gain enthalpy
4. All but fluorine shows positive oxidation states

Correct answer: Chlorine has the highest electron-gain enthalpy

Solution

Chlorine does not have the highest electron-gain enthalpy; fluorine has a lower value due to its small size and high electron-electron repulsion in its compact 2p orbital.

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