According to the kinetic theory of gases,which one of the following statements is wrong?

  • A
    All the molecules of a gas are identical.
  • B
    Collisions between the molecules of a gas and that of the molecules with the walls of the container are perfectly elastic.
  • C
    The molecules do not exert appreciable force on one another except during collision.
  • D
    The pressure exerted by a gas is due to the collision between the molecules of the gas.

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Which one of the following schematic graphs best represents the variation of $p V$ (in Joules) versus $T$ (in Kelvin) of one mole of an ideal gas? (The dotted line represents $p V=T$)

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$A$ box contains $N$ molecules of a perfect gas at temperature ${T_1}$ and pressure ${P_1}$. The number of molecules in the box is doubled while keeping the total kinetic energy of the gas the same as before. If the new pressure is ${P_2}$ and temperature is ${T_2}$,then:

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$(i)$ At low $......$ and high $......$ temperature,real gases behave as an ideal gas.
$(ii)$ $......$ is a measure of the average kinetic energy of a gas.
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