1.

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 mmB. (b)200 mmC. (c )900 mmD. (d)760 mm

Answer» 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


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