Mercury loses its meniscus on passing ozone through it. The meniscus be regained:
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a
by passing ozone for a longer time.
b
by shaking it with water.
c
by passing O2 gas.
d
by shaking it with liquor ammonia.
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.