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Q.

Two evacuated vessels A and B have volumes V and 4V respectively. Both vessel contain some water. The pressure in the space above water is P1 for vessel A and P2 for vessel B. What will be the relation between P1 and P2 ?

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a

P1 = 16P2

b

P1 = P2

c

4P1 = P2

d

P1 = 4P2

answer is C.

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Detailed Solution

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  • The pressure in the space above the water in each vessel is determined by the vapor pressure of water at the temperature of the system. 
  • Assuming that both vessels are at the same temperature, the vapor pressure of water will be the same in both vessels.
  • Therefore, the relation between P1 and P2 will be P1 = P2
  • The volume of the vessels is not relevant to the vapor pressure of water, so the ratio of the volumes does not affect the pressure.
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