Which of these is a characteristic test for ozone?

It does not give a brown solution with alcoholic benzidine.

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It tails mercury to form

H g_{2} O

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It gives blue colour to trimethyl base paper.

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All of these are confirming tests for ozone.

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Solution

The correct option is B It tails mercury to form $H g_{2} O$
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 $H g_{2} O .$

$H g_{2} O$ oxidises ozone to oxygen and itself reduces to HgO, a red coloured complex.
$H g_{2} O + O_{3} \to 2 H g O + O_{2}$

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