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Q.

Mercury boils at 3670C. However, mercury thermometers are made such that they can measure temperature up to 5000C. This is done by

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a

maintaining vacuum above mercury column in the stem of the thermometer

b

filling nitrogen gas at high pressure above the mercury column

c

filling nitrogen gas at low pressure above the mercury level

d

filling oxygen gas at high pressure above the mercury column

answer is B.

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Detailed Solution

By filling nitrogen gas at high pressure, the boiling point of mercury is increased which extend the range upto 5000C.
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Mercury boils at 3670C. However, mercury thermometers are made such that they can measure temperature up to 5000C. This is done by