JEE Main & Advanced Chemistry States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव Question Bank

done Kinetic molecular theory of gases and Molecular collisions Total Questions - 31

• question_answer1)
  Postulate of kinetic theory is      [EAMCET 1980]
  A)
                  Atom is indivisible done clear
  B)
                  Gases combine in a simple ratio done clear
  C)
                  There is no influence of gravity on the molecules of a gas done clear
  D)
                  None of the above done clear
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• question_answer2)
  According to kinetic theory of gases,       [EAMCET 1980]
  A)
                  There are intermolecular attractions done clear
  B)
                  Molecules have considerable volume done clear
  C)
                  No intermolecular attractions     done clear
  D)
                  The velocity of molecules decreases after each collision done clear
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• question_answer3)
  In deriving the kinetic gas equation, use is made of the root mean square velocity of the molecules because it is                 [Bihar MADT 1980]
  A)
                  The average velocity of the molecules done clear
  B)
                  The most probable velocity of the molecules done clear
  C)
                  The square root of the average square velocity of the molecules done clear
  D)
                  The most accurate form in which velocity can be used in these calculations done clear
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• question_answer4)
  Kinetic energy of a gas depends upon its[Bihar MADT 1982]
  A)
                  Molecular mass                done clear
  B)
                  Atomic mass done clear
  C)
                  Equivalent mass               done clear
  D)
                  None of these done clear
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• question_answer5)
  The kinetic theory of gases perdicts that total kinetic energy of a gaseous assembly depends on               [NCERT 1984]
  A)
                  Pressure of the gas         done clear
  B)
                  Temperature of the gas                done clear
  C)
                  Volume of the gas           done clear
  D)
                  Pressure, volume and temperature of the gas done clear
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• question_answer6)
  According to kinetic theory of gases, the energy per mole of a gas is equal to      [EAMCET 1985]
  A)
                  1.5 RT    done clear
  B)
                  RT done clear
  C)
                  0.5 RT    done clear
  D)
                  2.5 RT done clear
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• question_answer7)
  Internal energy and pressure of a gas per unit volume are related as       [CBSE PMT 1993]
  A)
                  \[P=\frac{2}{3}E\]            done clear
  B)
                  \[P=\frac{3}{2}E\] done clear
  C)
                  \[P=\frac{1}{2}E\]            done clear
  D)
                  \[P=2E\] done clear
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• question_answer8)
  The translational kinetic energy of an ideal gas depends only on its
  A)
                  Pressure              done clear
  B)
                  Force done clear
  C)
                  Temperature     done clear
  D)
                  Molar mass done clear
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• question_answer9)
  Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is     [IIT 1982]
  A)
                  Two times that of a hydrogen molecule done clear
  B)
                  Same as that of a hydrogen molecule done clear
  C)
                  Four times that of a hydrogen molecule done clear
  D)
                  Half that of a hydrogen molecule done clear
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• question_answer10)
  Which of the following is valid at absolute zero [Pb. CET 1985]
  A)
                  Kinetic energy of the gas becomes zero but the molecular motion does not become zero done clear
  B)
                  Kinetic energy of the gas becomes zero and molecular motion also becomes zero done clear
  C)
                  Kinetic energy of the gas decreases but does not become zero done clear
  D)
                  None of the above done clear
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• question_answer11)
  The average K.E. of an ideal gas in calories per mole is approximately equal to    [EAMCET 1989]
  A)
                  Three times the absolute temperature done clear
  B)
                  Absolute temperature  done clear
  C)
                  Two times the absolute temperature done clear
  D)
                  1.5 times the absolute temperature done clear
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• question_answer12)
  According to kinetic theory of gases, for a diatomic molecule [MNR 1991]
  A)
                  The pressure exerted by the gas is proportional to the mean velocity of the molecules done clear
  B)
                  The pressure exerted by the gas is proportional to the root mean square velocity of the molecules done clear
  C)
              The root mean square velocity is inversely proportional to the temperature done clear
  D)
                  The mean translational kinetic energy of the molecules is proportional to the absolute temperature done clear
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• question_answer13)
  At STP, 0.50 mol \[{{H}_{2}}\] gas and 1.0 mol He gas [CBSE PMT 1993, 2000]
  A)
                  Have equal average kinetic energies done clear
  B)
                  Have equal molecular speeds     done clear
  C)
                  Occupy equal volumes done clear
  D)
                  Have equal effusion rates done clear
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• question_answer14)
  Which of the following expressions correctly represents the relationship between the average molar kinetic energy, \[\overline{K.E.}\], of CO and \[{{N}_{2}}\] molecules at the same temperature [CBSE PMT 2000]
  A)
                  \[{{\overline{KE}}_{CO}}={{\overline{KE}}_{{{N}_{2}}}}\] done clear
  B)
                  \[{{\overline{KE}}_{CO}}>{{\overline{KE}}_{{{N}_{2}}}}\] done clear
  C)
                  \[{{\overline{KE}}_{CO}}<{{\overline{KE}}_{{{N}_{2}}}}\] done clear
  D)
                  Cannot be predicted unless the volumes of the gases are given done clear
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• question_answer15)
  Indicate the correct statement for a 1-L sample of \[{{N}_{2}}(g)\] and \[C{{O}_{2}}(g)\] at 298 K and 1 atm pressure
  A)
                  The average translational KE per molecule is the same in \[{{N}_{2}}\] and \[C{{O}_{2}}\] done clear
  B)
                  The rms speed remains constant for both \[{{N}_{2}}\] and \[C{{O}_{2}}\] done clear
  C)
                  The density of \[{{N}_{2}}\] is less than that of \[C{{O}_{2}}\] done clear
  D)
                  The total translational KE of both \[{{N}_{2}}\] and \[C{{O}_{2}}\] is the same done clear
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• question_answer16)
  With increase of pressure, the mean free path [Pb. CET 1985]
  A)
                  Decreases           done clear
  B)
                  Increases done clear
  C)
                  Does not change              done clear
  D)
                  Becomes zero done clear
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• question_answer17)
  Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas             [AIEEE 2005]
  A)
                  The most probable speed increases done clear
  B)
                  The fraction of the molecules with the most probable speed increases done clear
  C)
                  The distribution becomes broader done clear
  D)
                  The area under the distribution curve remains the same as under the lower temperature done clear
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• question_answer18)
  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           [CBSE PMT 1989, 91]
  A)
                  \[\frac{RT}{PM}\]            done clear
  B)
                  \[\frac{P}{RT}\] done clear
  C)
                  \[\frac{M}{V}\] done clear
  D)
                  \[\frac{PM}{RT}\] done clear
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• question_answer19)
  An ideal gas will have maximum density when   [CPMT 2000]
  A)
                  \[P=0.5\,atm,\,T=600\,K\] done clear
  B)
                  \[P=2\,atm,\,T=150\,K\] done clear
  C)
                  \[P=1\,atm,\,T=300\,K\] done clear
  D)
                  \[P=1.0\,atm,\,T=500\,K\] done clear
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• question_answer20)
  If the inversion temperature of a gas is \[-{{80}^{o}}C\], then it will produce cooling under Joule-Thomson effect at
  A)
                  298 K     done clear
  B)
                  273 K done clear
  C)
                  193 K     done clear
  D)
                  173 K done clear
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• question_answer21)
  Ratio of \[{{C}_{p}}\] and \[{{C}_{v}}\] of a gas 'X' is 1.4. The number of atoms of the gas 'X' present in 11.2 litres of it at N.T.P. is [CBSE PMT 1989]
  A)
                  \[6.02\times {{10}^{23}}\]            done clear
  B)
                  \[1.2\times {{10}^{24}}\] done clear
  C)
                  \[3.01\times {{10}^{23}}\]            done clear
  D)
                  \[2.01\times {{10}^{23}}\] done clear
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• question_answer22)
  The density of air is 0.00130 g/ml. The vapour density of air will be           [DCE 2000]
  A)
                  0.00065 done clear
  B)
                  0.65 done clear
  C)
                  14.4816 done clear
  D)
                  14.56 done clear
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• question_answer23)
  At \[{{100}^{o}}C\] and 1 atm, if the density of liquid water is 1.0 g \[c{{m}^{-3}}\] and that of water vapour is 0.0006 g \[{{m}^{-3}}\], then the volume occupied by water molecules in 1 litre of steam at that temperature is  [IIT 2000]
  A)
                  6 \[c{{m}^{3}}\]                done clear
  B)
                  60 \[c{{m}^{3}}\] done clear
  C)
                  0.6 \[c{{m}^{3}}\]             done clear
  D)
                  0.06 \[c{{m}^{3}}\] done clear
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• question_answer24)
  The ratio g  for inert gases is        [AFMC 1990]
  A)
                  1.33        done clear
  B)
                  1.66 done clear
  C)
                  2.13        done clear
  D)
                  1.99 done clear
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• question_answer25)
  The density of neon will be highest at    [CBSE PMT 1990]
  A)
                  S.T.P.     done clear
  B)
                  \[{{0}^{o}}C,\,2\,atm\] done clear
  C)
                  \[{{273}^{o}}C,\,1\,atm\]             done clear
  D)
                  \[{{273}^{o}}C,\,2\,atm\] done clear
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• question_answer26)
  Absolute zero is defined as the temperature [CBSE PMT 1990]
  A)
                  At which all molecular motion ceases done clear
  B)
                  At which liquid helium boils         done clear
  C)
                  At which ether boils                        done clear
  D)
                  All of the above done clear
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• question_answer27)
  Consider the following statements : (1)          Joule-Thomson experiment is isoenthalpic as well as adiabatic. (2)          A negative value of \[{{\mu }_{JT}}\] (Joule Thomson coefficient corresponds to warming of a gas on expansion. (3)          The temperature at which neither cooling nor heating effect is observed is known as inversion temperature. Which of the above statements are correct
  A)
                  1 and 2  done clear
  B)
                  1 and 3 done clear
  C)
                  2 and 3  done clear
  D)
                  1, 2 and 3 done clear
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• question_answer28)
  Vibrational energy is       [Pb. CET 1985]
  A)
                  Partially potential and partially kinetic done clear
  B)
                  Only potential done clear
  C)
                  Only kinetic done clear
  D)
                  None of the above done clear
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• question_answer29)
  At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole [MNR 1991]
  A)
                  Hydrogen done clear
  B)
                  Oxygen done clear
  C)
                  Methane             done clear
  D)
                  All the same done clear
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• question_answer30)
  Dimensions of pressure are the same as that of [CBSE PMT 1995]
  A)
                  Energy  done clear
  B)
                  Force done clear
  C)
                  Energy per unit volume done clear
  D)
                  Force per unit volume done clear
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• question_answer31)
  The density of a gas An is three times that of a gas B. if the molecular mass of A is M, the molecular mass of B is [CPMT 1987]
  A)
                  3 M        done clear
  B)
                  \[\sqrt{3}\]M done clear
  C)
                  \[M/3\]                done clear
  D)
                  \[M/\sqrt{3}\] done clear
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