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  4. Mercury loses its meniscus on passing ozone through it. The meniscus can be regained:

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Q. Mercury loses its meniscus on passing ozone through it. The meniscus can be regained:

The p-Block Elements - Part2

Solution:

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.