Chemistry - States of Matter

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Question - 1

Real gases approach ideal behaviour at

  • A high temperature and low pressure
  • B low temperature and low pressure
  • C high temperature and high pressure
  • D critical temperature

Question - 2

When the pressure gradient and temperature are held constant the rates of effusion of CO and N2 will be in the ratio

  • A 1:2
  • B 2:1
  • C 1:1
  • D 1:4

Question - 3

The product PV, where P and V represent pressure and volume respectively, is a unit of

  • A force
  • B energy
  • C entropy
  • D impulse

Question - 4

At a given temperature, volume, are pressure of a gas obeying van der Waals equation is

  • A less than that of an ideal gas
  • B more than trhat of an ideal gas
  • C more or less depending on the nature of gas
  • D equal to that of an ideal gas

Question - 5

The partial pressure of hydrogen in a flask containing 2 gm of hydrogen and 32 gm of SO2 is

  • A 2/3rd of the total pressure
  • B 1/6th of the total pressure
  • C 1/8th of the total pressure
  • D 1/9th of the total pressure

Question - 6

To which one of the following Dalton's law of partial pressure is not applicable?

  • A SO2 and CO2 at room temperature
  • B N2 and H2 at room temperature
  • C SO2 and O2 at room temperature
  • D HCl and NH3 at room temperature

Question - 7

Equal weights of methane and oxygen are mixed in any empty container at \({ 25 }^{ \circ }C\). The fraction of the total pressure exerted by oxygen is

  • A 1/2
  • B 2/3
  • C 1/3
  • D \(1/3+{273\over 298}\)

Question - 8

When the pressure is not too high the van der Waal's equation reduces to

  • A PV = RT - a/V
  • B PV = RT + Pb
  • C PV = RT - a/V2
  • D PV = RT

Question - 9

The temperature of a certain mass of a gas was increased from \({ 40 }^{ \circ }C\ to\ {41 }^{ \circ }C\) at constant pressure. The volume of the gas

  • A will increase by 1/273 of its volume at 273 K
  • B will increase by1/273of its volume at \({ 40 }^{ \circ }C\)
  • C will remain constant
  • D will increase, but the increase in volume cannot be predicted

Question - 10

Which one of the following is not the characteristic of an ideal gas?

  • A It obeys Boyle's law, Charle's law and Avogardo law
  • B When a gas is allowed to expand in vacuum, a cooling effect is observed
  • C The collisions between the molecular of a gas are elastic
  • D There is no attraction between the molecules of a gas