Q.1
The temperature of an ideal gas is reduced from 927°C to 27°C. The r.m.s. velocity of the molecules becomes... [ Kerala CEE 2001]
  • a) double the initial value
  • b) half of the initial value
  • c) four times the initial value
  • d) ten times the initial value
Q.2
the volume of an ideal gas is 44.8 lit at STP. Then at 267°C, What is its pressure is ...[ AFMC1998]
  • a) 1 atm
  • b) 2 atm
  • c) 4 atm
  • d) 6 atm
Q.3
in gas equation PV=nRT the correct statement is ...[ AFMC 1997]
  • a) P is the pressure of one mole of gas
  • b) V is the volume of one mole of gas
  • c) n is the number of moles of gas
  • d) n is the number of molecules of gas
Q.4
A gas can be liqified.. [ AFMC 2005]
  • a) above its critical temperature
  • b) at its critical temperature
  • c) below its critical temperature
  • d) at any temperature
Q.5
At 27°C , the ratio of rms velocity of ozone to oxygen is ...(EAMCET 1992]
  • a) √(3/5)
  • b) √(4/3)
  • c) √(2/3)
  • d) 0.25
Q.6
If the average velocity of N2 molecules is 0.3 m/s at 27°C, then the velocity of 0.6 m/s will takes place at ..[ Manipal PMT 2001]
  • a) 273 K
  • b) 927 K
  • c) 1000 K
  • d) 1200 K
Q.7
Container A and B have same gases. pressure, volume and temperature of A are all twice that of B, then the ratio of number of molecules of And B are:
  • a) 1 : 2
  • b) 2 : 1
  • c) 1 : 4
  • d) 4 : 1
Q.8
Diffusion of helium gas is
  • a) Four times faster than ClO2
  • b) Four times faster than NO2
  • c) Four times faster than SO2
  • d) Four times faster than CO2
Q.9
What is the pressure of 2 moles of NH3 at 27°C when its volume is 5L in van der Waals equation? ( a=4.17, b=0.03711) [ Orissa JEE 2004]
  • a) 10.33 atm
  • b) 9.333 atm
  • c) 9.74 atm
  • d) 9.2 atm
Q.10
The rms velocity of an ideal gas at 27°C is 0.3 m/s. Its rms velocity at 927°C ( in m-1) is ..[ IIT 1986]
  • a) 3.0
  • b) 2.4
  • c) 0.9
  • d) 0.6
Q.11
The kinetic energy of 4 moles of nitrogen gas at 127°C is ... cals ( R=2 cal mol-1 K-1) [ EAMCET 2003]
  • a) 4400
  • b) 3200
  • c) 4800
  • d) 1524
Q.12
Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speed in gas? [ AIEEE 2005]
  • a) The most probable speed increases
  • b) The fraction of the molecules with the most probable speed increases
  • c) The distribution becomes broader
  • d) The area under the distribution curve remains same as under the lower temperature
Q.13
At very high pressure, the compressibility factor of gas
  • a) Increases with increase of temperature
  • b) Decreases with increase of temperature
  • c) Remains constant with change in temperature
  • d) Is less than one
Q.14
When one mole of monoatomic ideal gas at T K undergoes adiabatic change under a constant external pressure of 1atm changes volume from 1 litre to 2 litre, the final temperature in Kelvin would be [ IIT 2005]
  • a)
    ch-5_qn-134choice_img_no1.png
  • b)
    ch-5_qn-134choice_img_no2.png
  • c) T
    ch-5_qn-134choice_img_no4.png
  • d)
Q.15
The average kinetic energy of an ideal gas per molecule in SI units at 25°C will be ... [ CBSE PMT 1996]
  • a) 6.17 × 10-21 kJ
  • b) 6.17 × 10-21 J
  • c) 6.17 × 10-20 J
  • d) 7.16× 10-20 J
Q.16
If r.m.s speed of gaseous molecules is x cm/sec at a pressure of p atm, then the r.m.s. speed at pressure of 2p atm and constant temperature will be .... [ Orissa JEE 2003]
  • a) x
  • b) 2x
  • c) 4x
  • d) x/4
Q.17
Pressure deviation from ideal behaviour takes place because of .. [ IIT 2003]
  • a) Molecular interaction between atoms and PV/nRT > 1
  • b) Molecular interaction between atoms and PV/nRT < 1
  • c) Finite size of atom of PV/nRT > 1
  • d) Finite size of atom of PV/nRT < 1
Q.18
At moderate pressure, compressibility factor of gas
  • a) Increases with increase in temperature
  • b) Decreases with increase in temperature
  • c) Remains constant with change in temperature
  • d) Is less than one
Q.19
At very low pressure, the compressibility factor of CO2 having constant value of molar volume
  • a) Increases with increase of molar volume
  • b) Decreases with increase in temperature
  • c) Remains constant with change in temperature
  • d) is one
Q.20
Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is [ AIEEE 2007]
  • a) 1/2
  • b) 2/3
  • c) (1/3) ×(273/298)
  • d) 1/3
Q.21
In an experiment during the analysis of a carbon compound, 145 cm3 of H2 was collected at 760 mmHg pressure and 27°C temperature. The mass of H2 is nearly ... [ MLNR 1987]
  • a) 10 mg
  • b) 12 mg
  • c) 24 mg
  • d) 6 mg
Q.22
What is the ratio of mean speed of an O3 molecule to the rms speed of an O2 molecule at the same temperature
  • a) (3π/7)1/2
  • b) (16/9π)1/2
  • c) (3π)1/2
  • d) (4π/9)1/2
Q.23
he compressibility of a gas is less than unit at STP, therefore [ IIT 2000]
  • a) Vm > 22.4 litres
  • b) Vm < 22.4 litres
  • c)Vm=22.4 litres
  • d)Vm=44.8 litres
Q.24
he total kinetic energy of 0.6 mol of an ideal gas at 27°C is
  • a) 1681 J
  • b) 2245 J
  • c)1122 J
  • d)2806 J
Q.25
In van der Waals equation of state of the gas law,the constant 'b' is measure of [ AIEEE 2004]
  • a) Intermolecular repulsions
  • b) Intermolecular collisions per unit volume
  • c) Volume occupied by the molecules
  • d) intermolecular attraction
Q.26
Ratio of CP and CV of a gas 'X' is is 1.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 ×1023
  • b) 1.2×1024
  • c) 3.01 ×101023
  • d) 2.01 ×1023
Q.27
The term that corrects for the attractive forces present in a real gas in the van der Waals equation is [ IIT 2009]
  • a)nb
  • b) an2 / V2
  • c)- (an2 / V2)
  • d)-nb
Q.28
The critical temperature of water is higher than that of O2 because the H2O molecules have [ IIT 1997]
  • a) Fewer electrons than O2
  • b) Two covalent bonds
  • c)V - shape
  • d)Dipole moment
Q.29
Which of the following expression is correct for an ideal gas?
  • a)
    ch-5_qn-149choice_img_no1.png
  • b)
    ch-5_qn-149choice_img_no2.png
  • c)
    ch-5_qn-149choice_img_no3.png
  • d)
    ch-5_qn-149choice_img_no4.png
Q.30
The density of air is is 0.00130 g/ml. The vapour density of the air will be ...[ DEC 2000]
  • a) 0.00065
  • b) 0.65
  • c) 14.4816
  • d) 14.56
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