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

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by shaking it with water.

by passing $O_{2}$ gas.

by shaking it with liquor ammonia.

by passing ozone for a longer time.

answer is B.

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Detailed 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.

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