The most commonly used thermometric liquid is :

water

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alcohol

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mercury

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None of these

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Solution

The correct option is C mercury
$A n s w e r : -$ C
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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