The only liquid which is a good conductor of heat is

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Water

Turpentine

Alcohol

Mercury

answer is D.

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Detailed Solution

Concept: According to the thermal properties of matter, mercury is the only liquid conductor of heat. That is why it is also used in a mercury thermometer.
We know that most metals are good conductors of heat as solid at room temperature. But mercury is the only good conductor of heat in a liquid state due to its high coefficient of expansion.
One more property of mercury that is its high boiling point makes it suitable for measuring high temperatures.
Hence, option 4 is correct.

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