By using mercury in a barometer:

the length of the tube remains handy

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taking reading becomes easy

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barometer works throughout a wide range of temperature

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all the above are true

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Solution

The correct option is D all the above are true
Mercury being a liquid of high density, the length of its column remains around 76 cm. So, the length of the glass tube need not be very high at all. Mercury is opaque and does not wet glass. So, it is easy to take the reading. Mercury remains liquid for a very wide range of temperature. So, barometer can work throughout a very wide range.

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