Which halogen oxidises water to liberate oxygen exothermally?
A. `F_2`
B. `Cl_2`
C. `Br_2`
D. `I_2`

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1 Answers

Correct Answer - A
`2H_2O + 2F_2 to 4HF +O_2, 3H_2O + 3F_2 to 6HF + O_3`
`F_2` react with water to form `O_2` and reaction is exothermic

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