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A glass bulb is connected to an open lim...

A glass bulb is connected to an open limb manometre. The level of mercury in both limbs of the manometer was same. The bulb was heated to `57^@C`. If the room temperature and the atmospheric pressure were `27^@C` and 750mm, the difference of levels in the two limbs now will be 

A

2. 5 cm

B

5.0 cm

C

7.5 cm

D

10.0 cm

Text Solution

Verified by Experts

The correct Answer is:
B
Initial pressure = 75 cm
`(P_1)/(T_1) = (P_2)/(T_2) = 75/300 = (P_2)/(320) implies P_2 = 80 cm`.
`:.` diff in limb = 5 cm .
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