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

filling nitrogen gas at low pressure above mercury column

filling nitrogen gas at high pressure above mercury column

filling oxygen gas at high pressure above mercury column

answer is C.

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Detailed Solution

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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