is most commonly used liquid in barometer.

Oil

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Mercury

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Water

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Sea water

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Solution

The correct option is B Mercury
The height of the barometer liquid should rise up to a plausible height (neither very high nor very low) for measuring the atmospheric pressure. Since, mercury has an optimal density, it is commonly used in the barometer. In standard conditions, the mercury level rises up to a height of $760 m m$ for atmospheric pressure.

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