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Q.

A glass tube 80 cm long and open at both ends is half immersed in mercury. Then the top of the tube is closed and it is taken out of the mercury. A column of mercury 20 cm long then remains in the tube. The atmospheric pressure (in cm of Hg) is

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a

90

b

75

c

60

d

45

answer is C.

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Detailed Solution

Let p0 = atmospheric pressure, then        p1V1=p2V2 or     p2=p1V1V2 or    p2=p04060=23p0Now, p2+(20cm of Hg)=p0 or   23p0+(20cm of Hg)=p0 or  p03=20cm of Hg         p0=60cm of Hg
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