Joule-Thomson coefficient ($\partial \mathrm{T}/\partial \mathrm{P}$)_H for an ideal gas is:

1. zero                                 

2. +ve

3. -ve                                   

4. none of these

All the three states H₂O, i.e., the triple point for H₂O the equilibrium,

                       Ice $\rightleftharpoons$Water$\rightleftharpoons$Vapour exist at:

1. 3.85 mm and 0.0981 $°$C

2. 4.58 mm and 0.0098 $°$C

3. 760 mm and 0$°$C

4. none of the above

A gas cannot be liquefied if:

1. Forces of attraction are low under ordinary conditions

2. Forces of attraction are high under ordinary conditions

3. Forces of attraction are zero under ordinary conditions

4. Forces of attraction are either high or low under ordinary conditions

The gas among the following that can be most steadily liquefied is -

1. NH₃                           

2. Cl₂

3. SO₂                           

4. CO₂

The correct statement regarding the van der Waal constant of  N₂ & NH₃ is -

1. ${\mathrm{a}}_{{\mathrm{NH}}_3}><mspace\; width="1em"></mspace>{\mathrm{a}}_{{\mathrm{N}}_2},<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{NH}}_3}<<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{N}}_2}$

2. ${\mathrm{a}}_{{\mathrm{NH}}_3}<<mspace\; width="1em"></mspace>{\mathrm{a}}_{{\mathrm{N}}_2},<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{NH}}_3}<<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{N}}_2}$

3. ${\mathrm{a}}_{{\mathrm{NH}}_3}><mspace\; width="1em"></mspace>{\mathrm{a}}_{{\mathrm{N}}_2},<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{NH}}_3}><mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{N}}_2}$

4. ${\mathrm{a}}_{{\mathrm{NH}}_3}<mspace\; width="1em"></mspace><<mspace\; width="1em"></mspace>{\mathrm{a}}_{{\mathrm{N}}_2},<mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{NH}}_3}><mspace\; width="1em"></mspace>{\mathrm{b}}_{{\mathrm{N}}_2}$

Maximum deviation from ideal gas is shown by-

1. H_2(g)   

2. N_2(g)

3. CH_4(g)

4. NH_3(g)

Joule-Thomson expansion of an ideal gas is an

(1) Isothermal process                             

(2) Isobaric process

(3) Isoenthalpic process                           

(4) Ideal process

Choose the correct statement for viscosity ($\mathrm{\eta }$) variation with T and P for an ideal gas-

1. $\mathrm{\eta }$ of a gas increases with increase in temperature (T), but it is independent of pressure

2. $\mathrm{\eta }$ of a gas decreases with increase in T and increases with increase in P

3. $\mathrm{\eta }$ of a gas is independent of temperature and pressure

4. $\mathrm{\eta }$ of a gas increases with increase in both T and P

The critical temperature and critical pressure of a gas obeying van der Waals’ equation are 30ºC and 73 atm respectively. Its van der Waals’ constant, b $\left(\mathrm{in}<mspace\; width="1em"></mspace>\mathrm{litres}<mspace\; width="1em"></mspace>{\mathrm{mol}}^{-1}\right)$ is, therefore

1. 0.500                                 

2. 0.060

3. 0.265                                 

4. 0.043

The critical volume of a gas is $0.072<mspace\; width="1em"></mspace>\mathrm{lit}.<mspace\; width="1em"></mspace>{\mathrm{mol}}^{–1}$. The radius of the molecule will be , in cm

1. ${\left(\frac{3}{4\mathrm{\pi }}\mathrm{x}{10}^{-23}\right)}^{\frac{\mathbf{1}}{\mathbf{3}}}$                           

2. ${\left(\frac{4\mathrm{\pi }}{3}\mathrm{x}{10}^{-23}\right)}^{\frac{\mathbf{1}}{\mathbf{3}}}$

3. ${\left(\frac{3\mathrm{\pi }}{4}\mathrm{x}{10}^{-23}\right)}^{\frac{\mathbf{1}}{\mathbf{3}}}$                           

4. $\left(\frac{3}{4\mathrm{\pi }}\mathrm{x}{10}^{-8}\right)$