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The boiling point of mercury is 367 $^{o}$ C. A mercury thermometer can be used to measure a temperature of 500 $^{o}$ C;
by filling the space above mercury with oxygen at high pressure
by filling the space above mercury with nitrogen at low pressure
by filling the space above mercury with nitrogen at high pressure
by keeping the space above mercury as vacuum

A

by filling the space above mercury with oxygen at high pressure

B

by keeping the space above mercury as vacuum

C

by filling the space above mercury with nitrogen at low pressure

D

by filling the space above mercury with nitrogen at high pressure

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