JEE Questions for Chemistry States Of Matter Quiz 4 - MCQExams.com

In two vessels of 1 L each at the same temperature 1 g of H2 and 1 g of CH4 are taken, for these
  • Vrms values will be same
  • kinetic energy per mole will be same
  • total kinetic energy will be same
  • pressure will be same
As the temperature is raised from 20°C to 40°C, the average kinetic energy of neon atoms changes by a factor of which of the following?
  • 1/2
  • √313/293
  • 313/293
  • 2
Which one of the following statements is not correct about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
  • The area under the distribution curve remains the same as under the lower temperature
  • The distribution becomes broader
  • The fraction of the molecules with the most probable speed increases
  • The most probable speed increases
Based on kinetic theory of gases following laws can be proved
  • Boyle's law
  • Charles' law
  • Avogadro's law
  • All of these

Chemistry-States of Matter-7607.png

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    Chemistry-States of Matter-7609.png

  • Chemistry-States of Matter-7610.png

  • Chemistry-States of Matter-7611.png

Chemistry-States of Matter-7613.png

  • Chemistry-States of Matter-7614.png
  • 2)
    Chemistry-States of Matter-7615.png

  • Chemistry-States of Matter-7616.png

  • Chemistry-States of Matter-7617.png
In the van der Waals' equation given below, [p + a (n / V )2 ] (V - nb)= nRT , the a (n / V )2 and -nb terms represent respectively, corrections for
  • derivations in the pressure and the temperature
  • intermolecular attractive forces and molecular volumes
  • intermolecular attractive forces and inelastic collisions
  • intermolecular repulsive forces and high temperatures
The temperature 30.98°C is called critical temperature (Tc ) of carbon dioxide. The critical temperature is the
  • lowest temperature at which liquid carbon dioxide is observed
  • highest temperature at which gas carbon dioxide is observed
  • highest temperature at which solid carbon dioxide is observed
  • highest temperature at which liquid carbon dioxide is observed
Positive deviation from ideal behaviour takes place because of
  • molecular interaction between atom and
    Chemistry-States of Matter-7619.png
  • molecular interaction between atom and
    Chemistry-States of Matter-7620.png
  • finite size of atoms and
    Chemistry-States of Matter-7621.png
  • finite size of atoms and
    Chemistry-States of Matter-7622.png
Gases X, Y, Z, P and Q have the van der Waals' constants a and b (in CGS units) as shown below.
Chemistry-States of Matter-7623.png
  • P
  • Q
  • Y
  • Z
  • X
When r, p and M represent rate of diffusion, pressure and molecular mass, respectively, then the ratio of the rates of diffusion (rA / rB ) of two gases A and B, is given as
  • ( pA / pB ) 1/2 ( MA / MB)
  • ( pA / pB ) ( MB / MA)1/2
  • ( pA / pB ) 1/2 ( MB / MA)
  • ( pA / pB ) ( MA / MB)1/2
Which one of the following volume (V) - temperature (T) plots represents the behaviour of one mole of an ideal gas at one atmospheric pressure?

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    Chemistry-States of Matter-7628.png

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  • Chemistry-States of Matter-7631.png

Chemistry-States of Matter-7633.png
  • 15.5
  • 0.155
  • 155.0
  • 1.55
Which of the following is a Boyle plot at very low pressure?

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  • 2)
    Chemistry-States of Matter-7636.png

  • Chemistry-States of Matter-7637.png

  • Chemistry-States of Matter-7638.png
Two gas cylinders having same capacity have been filled with 44 g of H2 and 44 g of CO2, respectively. If the pressure in CO2 cylinder is 1 atm at a particular temperature, then the pressure in the hydrogen cylinder at the same temperature is
  • 2 atm
  • 1 atm
  • 22 atm
  • 44 atm

Chemistry-States of Matter-7640.png
  • larger mean free path for Xas a compared to that of Y
  • larger mean free path for Y as compared to that of X
  • increased collision frequency of Ywith the inert gas as compared to that of X with the inert gas
  • increased collision frequency of X with the inert gas as compared to that of Y with the inert gas
Two gases X (molecular weight Mx) and Y (molecular weight My ; My > Mx) are at the same temperature T in two different containers. Their root mean square velocities are Cx and Cy, respectively. If the average kinetic energies per molecule of two gases X and Y are Ex and Ey respectively, then which of the following relation(s) is/are true?
  • Ex > Ey
  • Cx = Cy
  • Ex = Ey = ( 3/2 ) RT
  • Ex = Ey = ( 3/2 ) kB T
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is
  • 1.086 : 1
  • 1 : 1.086
  • 2 : 1.086
  • 1.086 : 2
Gases deviate from the ideal gas behaviour because their molecules
  • possess negligible volume
  • have forces of attraction between them
  • are polyatomic
  • are not attracted to one another
In the ideal gas equation, the gas constant R has the dimensions of
  • mole-atm/degree K
  • litre mole
  • litre-atm/degree K/mole
  • erg/degree K
Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is
  • two times that of a hydrogen molecule
  • same as that of a hydrogen molecule
  • four times that of a hydrogen molecule
  • half that of a hydrogen molecule
If a gas is expanded at constant temperature
  • the pressure increases
  • the kinetic energy of the molecules remains the same
  • the kinetic energy of the molecules decreases
  • the number of molecules of the gas increases
In the equation PV = nRT, which one cannot be the numerical value of R?

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    Chemistry-States of Matter-7643.png

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If P, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by

  • Chemistry-States of Matter-7646.png
  • 2)
    Chemistry-States of Matter-7647.png

  • Chemistry-States of Matter-7648.png

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The vander Waal’s constant ‘a’ for the gases O2, N2, NH3 and CH4 are 1.3, 1.390, 4.170 and 2.253 L2 atm mol-2 respectively. The gas which can be most easily liquefied is
  • O2
  • N2
  • NH3
  • CH4
Which of the following pairs will diffuse at the same rate through a porous plug?
  • CO, NO2
  • NO2, CO2
  • NH3, PH3
  • NO, C2H6
The r.m.s velocity at NTP of the species can be calculated from the expression

  • Chemistry-States of Matter-7652.png
  • 2)
    Chemistry-States of Matter-7653.png

  • Chemistry-States of Matter-7654.png
  • All the above
Root mean square velocity of a gas molecule is proportional to
  • m1/2
  • mo
  • m-1/2
  • m
In vander Waal’s equation of state for a non-ideal gas, the term that accounts for intermolecular forces is:
  • (V – b)
  • (RT)-1

  • Chemistry-States of Matter-7657.png
  • RT
In a closed flask of 5 litres, 1.0g of H2 is heated from 300 to 600K. Which statement is not correct?
  • Pressure of the gas increases
  • The rate of collision increases
  • The number of moles of gas increases
  • The energy of gaseous molecules increases
0:0:1


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