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States of Matter Test - 4

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States of Matter Test - 4
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  • Question 1
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    Physical behavior of the states differs greatly even though chemical behavior of the three states is identical because chemical properties depends upon ?

    Solution

    The question is based on the understanding of how the forces operate in a molecule. It is known that chemical properties depend on intramolecular bonding forces (holding the atoms in a molecule together), whereas physical properties depend on intermolecular non-bonding force (such as different kinds of polar interactions holding the molecules together).

  • Question 2
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    The average Kinetic energy and Thermal energy are proportional to the

    Solution

    The average KE and Thermal energy are proportional to absolute Temperature.

    The kinetic energy is the amount of motion in the atoms and molecules of a substance. The moleculess of the gas gain energy as the temperature increases as there is more motion of the molecules. As the temperature decreases the motion lessens until at absolute zero all motion (kinetic energy) stops.

  • Question 3
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    Gay Lussac’s law states that at constant volume, pressure of a fixed amount of a gas ?

    Solution

    The question is based on statement of Gay Lussac’s law-“ At constant temperature, the pressure of a given mass of a gas is directly proportional to its absolute temperature.”

    mathematically; 
    PαT (at constant temperature)
    or P/T = constant

  • Question 4
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    Separation of a mixture of gases on the basis of the difference in their rates of diffusion is called 
  • Question 5
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    Which of the following statements about Hydrogen bond incorrect?

    Solution

    Hydrogen atom covalently bonded to highly electronegative atom such as  N,O experience electrostatic field of another highly electronegative atom due to which a partial positive charge is developed on H atom.

  • Question 6
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    When a compressed real gas is allowed to expand through a porous plug at a temperature above its inversion temperature, there is
  • Question 7
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    dipole-dipole forces act between molecules that have

    Solution

    dipole dipole forces act between molecules that have a permanent electrical dipole moment,the partial charge of one molecule get attracted to the opposite charge of other molecule

  • Question 8
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    Which of the following options represents Avogadro's number?
  • Question 9
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    Which gas is most soluble in water?
  • Question 10
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    Which of the following liquids will exhibit the highest vapour pressure?
  • Question 11
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    Gases deviate from ideal behaviour because their molecules
  • Question 12
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    Directions: The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

    (A): van der Waals equation is applicable only to non-ideal gases.
    (R): Ideal gases obey the equation PV = nRT.
  • Question 13
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    Directions: The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

    (A): Helium shows only positive deviation from ideal behaviour.
    (R): Helium is an inert gas.
  • Question 14
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    Directions: The following question has four choices, out of which ONLY ONE is correct.

    The density of ammonia gas at 25oC and 2 atm pressure is about
  • Question 15
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    Which gas has the same rate of diffusion as that of CO2 at the same temperature and pressure?
  • Question 16
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    The kinetic theory of gases predicts that total kinetic energy of gaseous assembly depends on
  • Question 17
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    If two substances A and B have poA : poB = 1 : 2, where poA and poB are partial vapour pressures of A and B, and have mole fraction in the solution as 1 : 2, then what is the mole fraction of A in vapour phase?
  • Question 18
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    Directions: The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

    (A): The pressure of a fixed amount of an ideal gas is proportional to its temperature at constant volume.
    (R): Ideal gas molecules neither attract nor repel each other.
  • Question 19
    1 / -0
    Directions: The following question consists of an Assertion (A) and a Reason (R). Use the following options to mark the appropriate answer.

    (A): SO2 gas is easily liquefied while H2 is not.
    (R): SO2 has low critical temperature, while H2 has high critical temperature.
  • Question 20
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    The root mean square speeds at STP for the gases H2, N2, O2 and HBr are in the order
  • Question 21
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    Which are three important states of matter ?

    Solution

    Three phases of matter are :

    1. Solid - firm and stable in shape; not liquid or fluid, strongest intermolecular forces.
    2. Liquid - A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. Intermediate molecular forces. 
    3. Gas -Takes the volume of the container, weakest intermolecular forces.

  • Question 22
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    The intermolecular force primarily responsible for the condensed states of nonpolar substances is the

    Solution

    The intermolecular force primarily responsible for the condensed states of nonpolar substances is the dispersion force (or London force).

  • Question 23
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    At constant temperature, the pressure of a fixed amount (i.e., number of moles n) of gas is?

    Solution

    From ideal gas equation PV=nRT,
    keeping n and T fixed,
    P α 1/V. (Boyles Law)
    Here,
    T = Temperature
    P  = Pressure
    α.  = sign of Proportionality
    V  = Volume
    n= number of moles of gas
    R= Universal gas constant

  • Question 24
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    The mass of 11.2 L of ammonia gas at STP is
  • Question 25
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    Three states of matter are the result of?

    Solution

    Three states of matter are the result of balance between intermolecular forces and the thermal energy of the molecules. These two factors differentiate them from each other. For understanding, The strongest intermolecular forces are in solid then in liquid and weakest in gases.

  • Question 26
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    Directions: The following question has four choices out of which ONLY ONE is correct.

    An empty 2.0 l vessel is filled with CH4 (g) at 1.00 atm and O2 (g) at 4.00 atm, at 300oC. A spark causes CH4 to burn completely according to the equation:

    CH4(g) + 2O2(g) CO2(g) + 2H2O(g), H = – 802 kJ

    Partial pressure of oxygen inside the vessel after combustion is
  • Question 27
    1 / -0
    A mixture of N2 and O2 in the ratio 4 : 1 by volume is heated in an open mouthed flask from 27oC to 127oC. Which of the following statements is/are true?
  • Question 28
    1 / -0

    Gases have much lower density than the solids and liquids because ?

    Solution

    In gases, molecules are far apart from each other, thermal energy which is a measure of freeness of motion is thus very high resulting in a very large volume for the same mass(compared to solid and liquid). Hence there density is lowest.

  • Question 29
    1 / -0
    In the ideal gas equation PV = nRT, the value of R depends only on the
  • Question 30
    1 / -0
    With increase in pressure, the mean free path
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