According to Max well distribution of velocities:

  1. A small fraction of the molecule has very low velocities
  2. A small fraction of the molecule has either very high or very low velocities
  3. A small fraction of the molecule has very high velocities
  4. A small fraction of the molecule have either very high or either very low probable velocities

Answer (Detailed Solution Below)

Option 2 : A small fraction of the molecule has either very high or very low velocities
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Detailed Solution

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CONCEPT:

  • Basically Maxwell-Boltzmann distribution shows how the speed of molecules distributed for an ideal gas.
  • It can be represented with the following graph

F1 J.S 11.5.20 Pallavi D1

  • If we draw Maxwell's curve between the number of particles and velocity, we can see that the curve first rises from zero to a maximum then again reaches zero.
  • The total area under the graph represents the total no of molecules.

EXPLANATION:

  • From the shape of the curve, it is clear that only a certain no of molecules achieves very high velocities and very low velocities.  Therefore option 2 is correct.
  • The peak gives the no of molecules acquired high velocity and the flattened part gives the no of molecules that possess very low velocity.
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