By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?
  •   2.8

  •   4.0

  •   1.4

  •   2.0

The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19 J and bond energy per molecule is 4.0 x 10-19 J. The kinetic energy of the molecule per atom will be

  •  2.0×10-20 J

  •  2.2×10-19 J

  •  2.0×10-19 J

  •  4.0×10-20 J

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

  •   Z<1 and repulsive forces are dominant

  •   Z>1 and attractive forces are dominant

  •   Z>1 and repulsive forces are dominant

  •   Z<1 and attractive forces are dominant

A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and 0°C. At the same pressure but at
273°C, its volume will be:

  •   0.4 litre

  •   0.8 litre

  •   27.8 litre

  •   55.6 litre

Which is the correct curve for Charle's law, when the curve is plotted at 0.821 atm pressure for a 10-mole ideal gas?

 

 

 

  •   

  •   

  •   

  •   

Which is not correct curve for gay-lusacc's law?

 

  • 1 .  

  • 2.     

  • 3.   

  • 4.     

A certain hydrate has the formula MgSO4. xH2O. A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the water vapour generated exerts a pressure of 24.8 atm in a 2.0 L container at 120°C, the value of x is-

  •   2

  •   5

  •   6

  •   7

A mixture of Ne and Ar at 250 K has a total K.E.=3 kJ in a closed vessel, the total mass if Ne and Ar is 30 g. Find mass % of Ne in a gaseous mixture at 250 K.

  •   61.63 %

  •   38.37 %

  •   50 %

  •   28.3 %

In two vessels of 1 litre 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 mol will be same

  •   Total kinetic energy will be same

  •   Pressure will be same

Four particles have speed 2, 3, 4 and 5 cm/s respectively. Their rms speed is:

  •   3.5 cm/s

  •   27/2 cm/s

  •   54 cm/s

  •   54/2 cm/s

A gaseous mixture contains 4 molecules with a velocity of 6 cm sec-1, 5 molecules with a velocity of 2 cm sec-1 and 10 molecules with a velocity of 3 cm sec-1. What is the RMS velocity of the gas:

  •   2.5 cm sec-1

  •   1.9 cm sec-1

  •   3.6 cm sec-1

  •   4.6 cm sec-1

The ratio between the root mean square velocity of H2 at 50 K and that of O2 at 800 K is:

  •   4

  •   2

  •   1

  •   1/4

If C1, C2, C3... represent the speeds of n1, n2, n3... molecules respectively, then the root mean square speed will be:

  •   n1C12+n2C22+n3C32 +...n1+n2+n3 +...

  •   n1+n2+n3 +...2n1C12+n2C22+n3C32 +...

  •   n1C1n1+n2C2n2+n3C3n3

  •   n1C1+n2C2+n2C3 +...2n1+n2+n3 +...

At what temperature will average speed of the molecules of the second member of the series CnH2n be the same of Cl2 at 627°C?

  •   259.4 K

  •   400 K

  •   532.4 K

  •   None of these

If URMS of a gas is 30 R1/2 ms-1 at 27°C then the molar mass of gas is:

  •   0.02 kg/mol

  •   0.001 kg/mol

  •   0.003 kg/mol

  •   1 kg/mol

The compressibility factor for nitrogen at 330 K and 800 atm is 1.90 and at 570 K and 200 atm is 1.10. A certain mass of N2 occupies a volume of 1 dm3 at 330 K and 800 atm. Calculate volume occupied by same quantity of N2 gas at 570 K and 200 atm:

  •   1 L

  •   2 L

  •   3 L

  •   4 L

Consider the following statements. If the van der Waals' parameters of two gases are given as

                                a/dm6 bar mol-2                               b/dm3 mol-1Gas A                                6.5                                                 0.055Gas B                                  2                                                     0.01

then:

1.  Critical volume of A > Critical volume of B
2.  Critical pressure A > Critical temperature of B
3.  Critical temperature of A > Critical temperature of B

Which of the above statement is incorrect?

  •   1 alone

  •   1 and 2

  •   1, 2 and 3

  •   2 and 3

 The van der Waals parameters for gases W, X, Y and Z are

Gas

a (atm L2 mol-2)

b(L mol-1)

W

4.0

0.027

X

8.0

0.030

Y

6.0

0.032

Z

12.0

0.027

Which one of these gases has the highest critical temperature?

  •   W

  •   X

  •   Y

  •   Z

Pressure remaining the same, the volume of a given mass of an ideal gas increase for every degree centigrade rise in temperature by definite fraction of its volume at:

  •   0°C

  •   Its critical temperature

  •   Absolute zero

  •   Its Boyle temperature

The critical temperature of a substance is:

  •   The temperature above which the substance undergoes decomposition

  •   The temperature above which a substance can exist only in a gaseous state

  •   Boiling point of the substance

  •   All are wrong

The excluded volume of a gas will be larger, if TCPC is:

  •   small

  •   large

  •   equal to 1

  •   less than unity

The correct order of temperature of a real gas is-

I. Boyle's temperature

II. Critical temperature

III. Inversion temperature

  •   III > I > II

  •   I > II > III

  •   II > I > III

  •   I > III > II

The temperature at which the second virial coefficient of real gas is zero is called:

  •   Critical temperature

  •   Triple point

  •   Boiling point

  •   Boyle's temperature

However great the pressure, a gas cannot be liquified above its:

  •   Boyle temperature

  •   Inversion temperature

  •   Critical temperature

  •   Room temperature

The temperature at which real gases obey the ideal gas laws over a wide range of low pressure is called:

  •   Critical temperature

  •   Inversion temperature

  •   Boyle temperature

  •   Reduced temperature

What will happen to gas if it is adiabatically expanded at 600 K if its Boyle's temperature is 290 K?

  •   Heating

  •   Cooling

  •   Constant

  •   None

The van der Waal's equation of law of corresponding states for 1 mole of gas is:

  •   Pr+3Vr2 3Vr-1=8Tr

  •   Pr-3Vr2 3Vr-1=8Tr

  •   Pr+3Vr2 3Vr+1=8πTr

  •   Pr+3Vr2 3Vr+1=8

In water-saturated air, the mole fraction of water vapor is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is-

  • 1.17 atm

  • 1.76 atm

  • 1.27 atm

  •   0.98 atm

The volume occupied by 1.8 g of water vapour at 374 oC and 1 bar pressure will be -

[Use R=0.083 bar LK-1 mol-1]

  • 96.66 L

  • 55.87 L

  • 3.10 L

  • 5.31 L

A mixture of N2 and Ar gases in a cylinder contains 7 g of N2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is:

[Use atomic masses (in g mol-1): N=14, Ar=40]

  •  12 bar

  • 15 bar

  •  18 bar

  •  9 bar

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