States Of Matter CBSE Questions & Answers

States Of Matter

This is Chemistry Class 11 States of Matter CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
In the kinetic molecular theory attraction between molecules of the gas is
  • A
    less than zero
  • B
    greater zero
  • C
    depends on the speed of the molecule
  • D
    zero
    Correct
2
Real gases show deviations from ideal gas law because
  • A
    size of molecules cannot be measured
  • B
    molecules repel each other
  • C
    of experimental errors
  • D
    molecules interact with each other
    Correct
3
Which is the correct form of van der Waals equation?
  • A
    \(\left( {p - \frac{{a{n^2}}}{{{V^2}}}} \right)\left( {V - nb} \right) = nRT\)
  • B
    \(\left( {p - \frac{{a{n^2}}}{{{V^2}}}} \right)\left( {V + nb} \right) = nRT\)
  • C
    \(\left( {p + \frac{{a{n^2}}}{{{V^2}}}} \right)\left( {V + nb} \right) = nRT\)
  • D
    \(\left( {p + \frac{{a{n^2}}}{{{V^2}}}} \right)\left( {V - nb} \right) = nRT\)
    Correct
4
The deviation from ideal behavior can be measured in terms of compressibility factor Z, which is
  • A
    \(Z = \frac{{pV}}{{nRT}}\)
    Correct
  • B
    \(Z = \frac{V}{{nRT}}\)
  • C
    \(Z = \frac{{pV}}{{RT}}\)
  • D
    \(Z = \frac{{pV}}{{nR}}\)
5
behaviour of the gas becomes more ideal when
  • A
    number of moles is very low
  • B
    temperature is very low
  • C
    pressure is very low
    Correct
  • D
    pressure is very high
6
Critical temperature \(\left( {{{\text{T}}_{\text{C}}}} \right)\)of carbon dioxide is the highest temperature at which liquid carbon dioxide is observed. Above this temperature
  • A
    it is gas
    Correct
  • B
    it is mixture of solid and liquid
  • C
    it is solid
  • D
    it is liquid
7
Above the Critical temperature \(\left( {{{\text{T}}_{\text{C}}}} \right)\) of carbon dioxide
  • A
    Solidification of the gas is possible
  • B
    increase of pressure makes
  • C
    Liquefaction of the gas is possible
  • D
    Liquefaction of the gas is not possible
    Correct
8
The three states of matter of \({{\text{H}}_{\text{2}}}{\text{O}}\) are in equilibrium at
  • A
    critical point
  • B
    steam point
  • C
    the triple point
    Correct
  • D
    ice point
9
Surface tension decreases as the temperature is raised because
  • A
    Increase in temperature increases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases
    Correct
  • B
    Increase in temperature increases the kinetic energy of the molecules and effectiveness of intermolecular attraction increases
  • C
    Increase in temperature decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases
  • D
    Increase in temperature decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction is not changed
10
Viscous force is
  • A
    directly proportional to area and velocity gradient
    Correct
  • B
    directly proportional to velocity gradient and inversely proportional to area
  • C
    directly proportional to velocity gradient squared and inversely proportional to area
  • D
    directly proportional to area and inversely proportional to velocity gradient
11
Water has high surface tension and high capillarity because of
  • A
    dispersion forces
  • B
    ionic bonds
  • C
    Hydrogen bonds
    Correct
  • D
    covalent bonds
12
What will be the minimum pressure required to compress 500 \({\text{d}}{{\text{m}}^{\text{3}}}\)of air at 1 bar to 200 \({\text{d}}{{\text{m}}^{\text{3}}}\)at \({\text{3}}0^\circ {\text{C}}?\)
  • A
    2.0 bar
  • B
    1.5 bar
  • C
    3.5 bar
  • D
    2.5 bar
    Correct
13
A vessel of 120 mL capacity contains a certain amount of gas at \({\text{35 }}^\circ {\text{C}}\) and 1.2 bar pressure. The gas is transferred to another vessel of volume 180 mL at\({\text{35 }}^\circ {\text{C}}\). What would be its pressure?
  • A
    1.8 bar
  • B
    0.8 bar
    Correct
  • C
    2.8 bar
  • D
    0.4 bar
14
At\(0^\circ {\text{C}}\), the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?
  • A
    90 g/mol
  • B
    70 g/mol
    Correct
  • C
    170 g/mol
  • D
    270 g/mol
15
Pressure of 1 g of an ideal gas A at \({\text{27 }}^\circ {\text{C}}\) is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at same temperature the pressure becomes 3 bar. Relationship between their molecular masses is
  • A
    \({{\text{M}}_{\text{B}}} = {\text{ 4}}{{\text{M}}_{\text{A}}}\)
    Correct
  • B
    \({{\text{M}}_{\text{B}}} = {\text{ 5}}{{\text{M}}_{\text{A}}}\)
  • C
    \({{\text{M}}_{\text{B}}} = {\text{ 1}}0{{\text{M}}_{\text{A}}}\)
  • D
    \({{\text{M}}_{\text{B}}} = {\text{ 2}}{{\text{M}}_{\text{A}}}\)