Q49 / 118 · NTA Abhyas (NEET) 2020 · Chemistry · States of Matter

What will happen to the volume of a bubble of air found underwater in a lake, where the temperature is 15 oC and the pressure is 1.5 atm, if the bubble then rises to the surface where the temperature is 25 oC and the pressure is 1.0 atm?

  • A
    Its volume will become greater by a factor of 2.4
  • Correct answer
    B
    Its volume will become greater by a factor of 1.55
  • C
    Its volume will become greater by a factor of 1.2
  • D
    Its volume will become smaller by a factor of 0.80

Solution

P1ViT1=P2VfT2
Vf=P1T2P2T1.Vf
Vi= volume of water bubble under water
Vf= volume of water bubble at the surface
Vf=1.5×298Vi1×288=447288Vi = 1.55 Vi
The volume becomes greater by a factor of 1.55.

Hence, the correct answer is option: 'B'.

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