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Q.

A liquid of density 800 kgm-3 is used instead of mercury in the Torricelli barometer: 
The height of the liquid column is (Density of mercury =13.6 ×103 kgm-3 and atmospheric pressure =76 cm of Hg)

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a

800 m

b

13.2 m

c

12.9 m

d

13.6 m

answer is B.

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Detailed Solution

Pressure due to 76 cm of mercury is equal to  pressure due to h  height of liquid column

13.6×103×0.76=h×800 h=12.92 m

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A liquid of density 800 kgm-3 is used instead of mercury in the Torricelli barometer: The height of the liquid column is (Density of mercury =13.6 ×103 kgm-3 and atmospheric pressure =76 cm of Hg)