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States of Matter Test - 5

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States of Matter Test - 5
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The van der Waals equation is true for
  • Question 2
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    Dalton’s Law of Partial Pressures states that the total pressure exerted by the mixture of non-reactive gases is equal to the

    Solution

    The question is based on the statement of Dalton Law of Partial pressures for Gases which states that total pressure exerted by mixture of non reacting gases is equal to the sum of partialpressure of individual gases.

  • Question 3
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    Critical temperature (TC)of carbon dioxide is the highest temperature at which liquid carbon dioxide is observed. Above this temperature

    Solution

    Tc is the highest Temp where a gas can exist in liquid state. Above this no liquid state exist. It is impossible to compress the gas into liquid above critical temperature, no matter what ever amount of pressure is applied.

  • Question 4
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    Directions: The following question has four choices out of which ONLY ONE is correct.

    Two molecules A and B have masses 100 kg and 64 kg, respectively and rate of diffusion of A is 12  10-3. What will be the rate of diffusion of B?
  • Question 5
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    Which of the following is the correct ideal gas law

    Solution

    PV=nRT is the correct Ideal Gas equation.

    Here, P : Pressure

              V : Volume

              n  : Number of  Moles

               R : Universal Gas Constant

               T  : Temperature

  • Question 6
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    Water has high surface tension and high capillarity because of

    Solution

    In water molecules, due to high electronegitivity difference between H and O atoms and lone pairs of electrons on oxygen atom, greater number of hydrogen bonds  formed

  • Question 7
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    The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called
  • Question 8
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    According to __________ "equal volumes of all gases at the same temperature and pressure contain equal number of molecules."

    Solution

    This question is based on statement of Avogadro's law that states 'Equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules'.

    V ∝ n (at constant T and P)

  • Question 9
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    What is the relation between total pressure and individual pressures before mixing the constituent gases at constant temperature?
  • Question 10
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    Directions: The following question consists of an Assertion (A) and a Reason (R). Use the following to mark the appropriate answer.

    (A): Under similar conditions of temperature and pressure, O2 diffuses 1.4 times faster than SO2.
    (R): Density of SO2 is 1.4 times greater than that of O2.
  • Question 11
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    At what temperature(s) are solids and liquids in equilibrium under 1 atm pressure?
  • Question 12
    1 / -0
    The root mean square velocity of a gas becomes double when temperature is
  • Question 13
    1 / -0
    What is the value of the gas constant R (expressed in L atmoR–1 mol–1) at 32oF if temperature is expressed on Rankine scale?
  • Question 14
    1 / -0
    Two moles of H-atoms at NTP occupy a volume of
  • Question 15
    1 / -0
    Which of the following volume (V) vs. temperature (T) plots represents one mole of an ideal gas at one atmospheric pressure?
  • Question 16
    1 / -0
    The most probable velocity (in cm/sec) of hydrogen molecules at 27oC will be
  • Question 17
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    At a temperature of 30oC, vapour pressure of water is 20 torr. If relative humidity is 45%, calculate the number of moles of water present in one litre of air at 30oC.
  • Question 18
    1 / -0
    Gases become ideal at
  • Question 19
    1 / -0
    The temperature below which a gas becomes cooler on expansion, is called
  • Question 20
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    Which of the following represents the units of the van der Waal's constant 'a'?
  • Question 21
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    Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?

    Solution

    Viscosity is inversely proportional to temperature., hence viscosity of the given liquid decreases with rise in temperature since, the liquid particles can move more freely as the friction between them become lesser. 

  • Question 22
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    behaviour of the gas becomes more ideal when

    Solution

    This question is based on understanding the concept of molecular interactions between molecule of real gases which is least at low P and High T condition. Thus under these conditions real gases behave as ideal.

  • Question 23
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    Which of the following isobars  demonstrates Charle's Law ?
  • Question 24
    1 / -0

    In the kinetic molecular theory attraction between molecules of the gas is

    Solution

    The Kinetic Theory of Gases assumes that no intermolecular forces exerts between the gas molecules.

  • Question 25
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    A reaction mixture for the combustion of SO2 was prepared by opening a stop-cork separating two chambers, one with a volume of 4.25 L at 0.75 atm of SO2 and the other with a 3.0 L volume filled at 0.5 atm of O2. Both gases were at 80oC. The mixture was passed over a catalyst that promoted the formation of SO3 and then was returned to the two originally connected vessels. Conversion of SO2 was completely subject to the availability of oxygen. Which of the following statements is true?
  • Question 26
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    The volumes of ozone and chlorine diffusing during the same time are 35 ml and 29 ml, respectively. If the molecular weight of chlorine is 71, calculate the molecular weight of ozone.
  • Question 27
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    Real gases show deviations from ideal gas law because

    Solution

    Real gases have intermolecular forces of interaction due to which there is a difference in the actual pressure values when compared to the ideal gases, the pressure is found to be less than the pressure of ideal gases under similar conditions, similar deviation occurs when the size of molecules is taken into account due to which volume correction is required.

  • Question 28
    1 / -0
    Avogadro's hypothesis states that
  • Question 29
    1 / -0
    Which of the following gases is expected to have the largest value of van der Waals constant 'a'?
  • Question 30
    1 / -0

    Surface tension decreases as the temperature is raised because increase in temperature 

    Solution

    Surface tension is inversely proportional to the temperature. So surface tension decreases with rise in temperature. With rise in temeprature liquids exapands, the interparticle distance increases and the kinetic energy of molecules and hence disorder decreases, so intermolecular forces decreases results in decrease in surface tension.

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