Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
Explain laboratory preparation of ozone.
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Answer
When a slow dry stream of oxygen is passed through a silent electric discharge, oxygen is converted into ozone $($about $10\%). $ The mixture is called ozonised oxygen. $3 O _2 \xrightarrow{\text { electric } \text { discharge }} 2 O _3 \Delta H=+142 kJ$
It is an endothermic reaction.
Silent electric discharge prevents the decomposition of ozone.
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