1.

Which of the following reactions is employed toproduce ozone in the laboratory ?

Answer»

Exposure of air to U.V. light lea
Reaction of `F_2` with `H_O` at low temperature
Reaction of `SO_2" with "H_2O_2`
Passage of SILENT electric discharge through `O_2`

Solution :Ozone is formed, when energy is supplied to dioxygen in the form of UV radiation or silent electric discharge.
`3O_(2_((g))) Leftrightarrow 2O_(3_((g))),DeltaH=142.7" kJ mol"^(-1)`
Since `O_3` is an endothermic molecule, so it is necessary to use a silent electric discharge, otherwise sparking would GENERATE heat and decompose it. This is the LABORATORY method.
a) Exposure of `O_2` of air UV light ALSO form `O_3`. This occurs in atmosphere, when photochemical smog is formed over cities like DELHI, Los Angeles or Tokyo.
(b). `2H_(2)O+2F_(2) to 4HF+O_(2)`
`3H_(2)O+3F_(2) to 6HF+O_(3)`
(c). `SO_(2)+H_(2)O_(2) to H_(2)SO_(4)`


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