Alcohol is used as thermometric liquid for measuring very low temperature because

it freezes below -100°C

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it is easily available

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it is cheap

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it can be brightly coloured.

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Solution

The correct option is D
it can be brightly coloured.

The freezing point of alcohol is below -100°C.
Alcohol can be brightly coloured, hence it can be easily seen in the glass capillary tube.
Hence, option (a) & (d) are the correct answer.

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