1.

Which one of halogen oxidizes water to oxygen with large evolution of heat?

Answer»

`F_(2)`
`Cl_2`
`Br_(2)`
`I_(2)`

Solution :F atoms are REDUCED to `F^(-)`
`2F_(2)+2H_(2)O to 4HF+O_(2)+"Heat"`
`3F_(2)+3H_(2)O to 6HF+O_(3)+"Heat"`
A similar relation of chlorine with `H_(2)O` occurs, but the reaction is very slow, because the energy of activation is HIGH.


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