Question

13. In high temperature thermometers, nitrogen is used to fill the space above mercury because _____

a. It reduces evaporation of mercury
b. It makes mercury bond tighter
c. It helps to show the correct temperature
d. It changes its temperature according to the temperature of mercury
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Answer 1

Answer:

Option a is the correct answer.

Explanation:

In high temperature thermometers, nitrogen is used to fill the space above mercury because it reduces evaporation of mercury.

Nitrogen is inert to mercury and hence, does not react with mercury.

It prevents vaporization of mercury by exerting pressure on it, thereby increasing its boiling point. This makes mercury maintain its liquid state.

Answer 2

Option A is correct answer.