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Question

Which of these is a characteristic test for ozone?

A
It does not give a brown solution with alcoholic benzidine.
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B
It tails mercury to form Hg2O
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C
It gives blue colour to trimethyl base paper.
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D
All of these are confirming tests for ozone.
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Solution

The correct option is B It tails mercury to form Hg2O
Tailing of mercury test : When ozone is passed through mercury, it loses its meniscus and sticks to the glass due to the formation of mercurous oxide. This is called tailing of mercury. The meniscus can be restored by shaking it with water

characteristic test for ozone is its treatment with Hg2O.

Hg2O oxidises ozone to oxygen and itself reduces to HgO, a red coloured complex.
Hg2O+O32HgO+O2


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