Which liquid metal is used for making thermometers?

Mercury

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Bromine

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Iodine

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Cadmium

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Solution

The correct option is A Mercury
Mercury is used in many thermometers.
Since Liquids have a definite volume but indefinite shape, it is convenient to use a liquid to make a thermometer since the liquid will expand/contract based on heating and you can measure the temperature with just a ruler. Mercury is a liquid for a large temperature range around room temperature, so it is convenient.

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