Question

Given J-tube has 2.4 mL of air at a pressure of 1 atm. On adding mercury, volume of air is reduced to 1.9 mL as shown. Difference in the level of mercury in two columns is:

A. (a)700 mm
B. (b)200 mm
C. (c )900 mm
D. (d)760 mm

Answer 1

Correct Answer - B
Atmospheric pressure `=76` mmHg
`implies P_(1)V_(1)=P_(2)V_(2)`
`P_(2)=(P_(1)V_(1))/V_(2)=(760xx2.4)/1.9=960` mmHg
`:.` Difference in column `=960-760=200` mmHg