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Question

Mercury is generally used in thermometer because it has a

A
High fluidity
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B
High density
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C
High coefficient of expansion
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D
High specific heat
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Solution

The correct option is D High coefficient of expansion
Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.

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