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States of Matter Test - 6

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States of Matter Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The surface tension of which of the following liquids is the maximum?
  • Question 2
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    The vapor pressure of different substances at the same temperature increases if

    Solution

    Vapour pressure of a substance is inversely proportional to the intermolecular forces between molecules.

  • Question 3
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    Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is

    Solution

    Partial charge is a small charge developed by displacement of electrons. It is less than unit electronic charge and is represented as δ+ or δ–

  • Question 4
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    The enthalpies of vaporisation of H2O, C2H5OH and CS2 are 40.6, 38.6 and 26.8 kJ/mol, respectively. The decreasing order of intermolecular forces in these liquids is:
  • Question 5
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    A student forgot to add the reaction mixture to the round bottomed flask at 27 °C , but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?

    Solution

  • Question 6
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    Consider the following graph.



    Which of the following statements is wrong?
  • Question 7
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    What will be the minimum pressure required to compress 500 dm3of air at 1 bar to 200 dm3at 30°C?

    Solution

    Using ideal gas equation, PV=nRT,
    since T is constant, we have
    P1V1 = P2V2 i.e.
    500 dm3 ×1bar = 200dm3×P2
    which gives P2= 2.5 bar

  • Question 8
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    Dipole–induced dipole interactions are present in which of the following pairs?
  • Question 9
    1 / -0
    The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles, but their magnitude depends upon
  • Question 10
    1 / -0
    Which of the following substances, when dissolved in water, increases the surface tension of water?
  • Question 11
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    For hydrogen gas, the values of Van der Waals constants 'a' and 'b' are 0.245 atm litre2 mol-2 and 0.026 litre mol-1, respectively. Calculate the volume of 1 mol of hydrogen at 5 atm and 0oC.
  • Question 12
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    Which of the following properties of water can be used to explain the spherical shape of rain droplets?
  • Question 13
    1 / -0
    Calculate the weight of CH4 in a 9 litre cylinder at 16 atm and 27oC.
    (R = 0.08 L atm/K)
  • Question 14
    1 / -0
    What is the dominate intermolecular force that must be overcome in converting liquid CH3OH into gas?
  • Question 15
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    In order to increase the volume of a gas by 10%, the pressure of the gas should be
  • Question 16
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    100 ml of a gas diffuses in the same time as 75 ml of ammonia at 30oC and 743 torr. What is the molecular mass of the gas?
  • Question 17
    1 / -0
    For a Van der Waals gas, the expression for Boyle's temperature is
  • Question 18
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    What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25oC and the pressure is 1.0 atm?
  • Question 19
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    If 10-4 dm3 of water is introduced into a 1.0 dm3 flask at 300 K, then how many moles of water are in the vapour phase when the equilibrium is established?

    (Given: Vapour pressure of H2O at 300 K is 3170 Pa and R = 8.314 J K-1 mol-1)
  • Question 20
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    The van der Waals Equation adjusts the measured volume

    Solution

    nb is subtracted.where, the constant b is called co-volume or excluded volume per mole of a gas. it measure the effective size of gas molecule (V-nb)

  • Question 21
    1 / -0

    The van der Waals Equation adjusts the measured pressure

    Solution

    (an2) ÷ V2 term term is added, where constant 'a' is gives the magnitude of attractive forces between gas molecules. 

  • Question 22
    1 / -0

    The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

    Solution

    London dispersion forces operate only over very short distance. The energy of interaction varies as 1/(distance between two interacting particles)6. Large or more complex are the molecules, greater is the magnitude of London forces. This is obviously due to the fact that the large electron clouds are easily distorted or polarised. Hence, greater the polarisability of the interacting particles, greater is the magnitude of the interaction energy.

  • Question 23
    1 / -0
    68 ml of a sample of nitrogen is collected over water at 20oC and 700 mm of Hg. The volume of dry nitrogen at STP is
    [The aq. tension of water is 17.5 mm of Hg at 20oC.]
  • Question 24
    1 / -0

    A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:

    Solution

    As we move to higher altitude, the atmospheric pressure decreases. Therefore, boiling point of water also decreases, hence , cooking of food takes longer time without using pressure cooker.

  • Question 25
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    A gas in outer space is at a pressure of 5 x 10-14 torr. When the temperature is constant, how much outer space could you compress into 1 dm3 box at 1 atmosphere?
  • Question 26
    1 / -0
    An open vessel at 37oC is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant, the temperature to which the vessel is heated is
  • Question 27
    1 / -0

    Which of the following property of water can be used to explain the spherical shape of rain droplets?

    Solution

    Due to surface Tension, the water droplet tends to acquire minimum surface area, hence water droplet attains spherical shape.

  • Question 28
    1 / -0
    Equal weights of ethane and hydrogen are mixed in an empty container at 25oC. Determine the fraction of total pressure exerted by hydrogen.
  • Question 29
    1 / -0
    Choose the incorrect statement.
  • Question 30
    1 / -0

    As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?

    Solution

    P α T at constant volume.This is according to Gay Lussac’s law-“ At constant volume, the pressure of a given mass of a gas is directly proportional to its absolute temperature.”

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