(B) The test for ozone $O_3$ is performed using mercury $(Hg)$.When ozone reacts with mercury,it forms mercurous oxide $(Hg_2O)$.The reaction is: $6Hg

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(B) The test for ozone $O_3$ is performed using mercury $(Hg)$.When ozone reacts with mercury,it forms mercurous oxide $(Hg_2O)$.The reaction is: $6Hg + O_3 \to 3Hg_2O$.During this reaction,mercury loses its meniscus and starts sticking to the glass surface,which is a characteristic test for ozone.