The apparatus used for the determination of surface tension of a liquid is

Hygrometer

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Stalagmometer

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Lactometer

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Thermometer

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Solution

The correct option is B
Stalagmometer

A stalagmometer is a device for investigating surface tension using the stalagmometric method. It is also called a stactometer or stalogometer.A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere.Lactometer is used to measure purity of milk.

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