Q.

What is the major reason for using mercury (rather than water) in barometers?

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a

Mercury is chemically unreactive compared with water.

b

Mercury expands with a decrease in air pressure; water does not.

c

Mercury is much denser than water.

d

Mercury has a higher boiling point than water

answer is A.

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Detailed Solution

Mercury is much denser than water because when the air pressure drops, mercury expands while water does not expand.

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