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Q.

Mercury boils at a temperature of 367°C; however mercury thermometers are made which can measure up to 500°C. This  is done by: 

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a

filling nitrogen gas at low pressure above mercury column

b

maintaining vacuum above the Hg column in the stem of the thermometer

c

filling nitrogen gas at high pressure above mercury column 

d

filling oxygen gas at high pressure above mercury column

answer is C.

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Detailed Solution

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if we fill nitrogen gas at a high pressure above mercury level,the boiling point of mercury is increased 

which can extended to the range up to 5000C

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