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Q.

Tailing of mercury test can be used for which of the following gas?

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a

Dioxygen

b

Dihydrogen

c

Dinitrogen

d

Ozone

answer is D.

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Detailed Solution

As ozone passes through mercury it loses the meniscus and sticks to the glass because of mercury oxide formation. This is called mercury tailing. One can recover the meniscus by stirring it with water.The chemical reaction is written as2Hg + O3 → Hg2O + O2
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