Practice Test 8
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The ratio of Boyle’s temperature and critical temperature fora gas is :

  • Solution

    Boyle’s temperature,

    TB = a⁄Rb and critical temperature, TC = 8a⁄27Rb

    ∴ TB⁄TC = 27⁄8

A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram

Small droplets of a liquid are usually more spherical in shape than larger drops of the same liquid because

A manifestation of surface tension is :

  • Solution

    All the given phenomena are due to surface tension

A drop of oil is placed on the surface of water. Which of the following statement is correct ?

If temperature increases, the surface tension of a liquid

The r.m.s Velocity of hydrogen is √7 times the r.m.s velocity of nitrogen. If T is the temperature of the gas, than

  • Solution

Soap helps in cleaning clothes, because

  • Solution

    Soap helps to lower the surface tension of solution, thus soap get stick to the dust particles and grease and these are removed by action of water.

In which molecule the van der Waal’s force is likely to be the most important in determining the m.pt. and b.pt.?

Same mass of CH4 and H2 is taken in container, The partial pressure caused by H2 is

  • Solution

    Let the mass be x, then moles of CH4 and H2 are x⁄16 & x⁄2;

    Total moles = 9x⁄16

    pH2 = mole Fraction × P = \(\frac{x/2}{9x/16}.P = \frac{8}{9}P\)

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