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. 1.17 atm

2. 1.76 atm

3. 1.27 atm

4.  0.98 atm

The volume occupied by 1.8 g of water vapour at 374 ${}^{\mathrm{o}}\mathrm{C}$ and 1 bar pressure will be -

[Use R=0.083 bar ${\mathrm{LK}}^{-1}$ ${\mathrm{mol}}^{-1}$]

1. 96.66 L

2. 55.87 L

3. 3.10 L

4. 5.31 L

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

1.  $\left({\mathrm{P}}_{\mathrm{r}}+\frac{3}{{\mathrm{V}}_{\mathrm{r}}^2}\right) \left(3{\mathrm{V}}_{\mathrm{r}}-1\right)=8{\mathrm{T}}_{\mathrm{r}}$

2.  $\left({\mathrm{P}}_{\mathrm{r}}-\frac{3}{{\mathrm{V}}_{\mathrm{r}}^2}\right) \left(3{\mathrm{V}}_{\mathrm{r}}-1\right)=8{\mathrm{T}}_{\mathrm{r}}$

3.  $\left({\mathrm{P}}_{\mathrm{r}}+\frac{3}{{\mathrm{V}}_{\mathrm{r}}^2}\right) \left(3{\mathrm{V}}_{\mathrm{r}}+1\right)=8{\mathrm{\pi T}}_{\mathrm{r}}$

4.  $\left({\mathrm{P}}_{\mathrm{r}}+\frac{3}{{\mathrm{V}}_{\mathrm{r}}^2}\right) \left(3{\mathrm{V}}_{\mathrm{r}}+1\right)=8$

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

1.  Heating

2.  Cooling

3.  Constant

4.  None

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

1.  Critical temperature

2.  Inversion temperature

3.  Boyle temperature

4.  Reduced temperature

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

1.  Boyle temperature

2.  Inversion temperature

3.  Critical temperature

4.  Room temperature

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

1.  Critical temperature

2.  Triple point

3.  Boiling point

4.  Boyle's temperature

The correct order of temperature of a real gas is-

I. Boyle's temperature

II. Critical temperature

III. Inversion temperature

1.  III > I > II

2.  I > II > III

3.  II > I > III

4.  I > III > II

The excluded volume of a gas will be larger, if $\frac{{\mathrm{T}}_{\mathrm{C}}}{{\mathrm{P}}_{\mathrm{C}}}$ is:

1.  small

2.  large

3.  equal to 1

4.  less than unity

The critical temperature of a substance is:

1.  The temperature above which the substance undergoes decomposition

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

3.  Boiling point of the substance

4.  All are wrong