Gas is enclosed in a container of 20 cm3 with a moving piston. According to the kinetic theory of gases, what will be the effect on freely moving molecules of the gas if the temperature is increased from 20 oC to 100 oC?
Correct answer: B. The volume will be increased
- A. Pressure will become one half
- B. The volume will be increased
- C. Temperature has no effect on freely moving molecules
- D. Colliding capability of molecule will become lower
Explanation
According to Charles's law, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the pressure remains constant. Since the piston is movable, hence increased temperature causes the volume to be increased.
This question appeared on the UHS MDCAT 2018 paper, which you can sit online with every answer explained.
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About Charles's Law
At constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. Questions involve the Kelvin scale, the equation V₁/T₁ = V₂/T₂, volume-temperature graphs, and the need to distinguish Charles's law from Boyle's law, which relates pressure and volume.
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