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Questions  

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

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

detailed solution

Correct option is B

By filling nitrogen gas at high pressure, the boiling point of mercury is increased which extend the range upto 5000C.

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