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At lower temperature, all gases except H₂ and He show:
1. Negative deviation
2. Positive deviation
3. Positive and negative deviation
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 deviation of a gas from ideal behavior is expected to be minimum at -                                    
1. 350 K and 3 atm                   
2. 550 K and 1 atm
3. 250 K and 4 atm                   
4. 450 K and 2 atm

The gas among the following that can be most steadily liquefied is -
1. NH₃                           
2. Cl₂
3. SO₂                           
4. CO₂

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 density of a gaseous substance at 1 atm pressure and 773 K is 0.4 g/L. If the molecular weight of the substance is 30, the dominant force existing among gas molecules is/are-

Van der Waals equation at low pressure is -
1. PV = RT - Pb
2. PV = RT - $\frac{\mathrm{a}}{\mathrm{V}}$
3. PV = RT + $\frac{\mathrm{a}}{\mathrm{v}}$
4. PV = RT + Pb

The unit of van der Waals' constant 'b' is -
1. cm³ mol^-1
2. litre mol^-1
3. m³ mol^-1
4. All of the above

The compressibility factor for H₂ and He is usually-
1. >1                                     
2. =1
3. <1                                     
4.  Zero

At high pressure, the compressibility factor 'Z' is equal to -
1.  Unity
$2.$ $1-\frac{\mathrm{Pb}}{\mathrm{RT}}$
$3.$ $1+\frac{\mathrm{Pb}}{\mathrm{RT}}$
4.  Zero

The compressibility factor for 1 mol of a van der Waals gas at $0°\mathrm{C}$ and 100 atmospheric pressure is found to be 0.5. The volume of gas is-
1. 2.0224 L
2. 1.4666 L
3. 0.8542 L
4. 0.1119 L

A helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is-
1. Same as that of a hydrogen molecule
2. Half that of a hydrogen molecule
3. Two times that of a hydrogen molecule 
4. Four times that of a hydrogen molecule 

The compressibility factor of a gas is less than unity at STP. The correct statement among the following is -
1. ${\mathrm{V}}_{\mathrm{m}}$  > 22.4 L
2. ${\mathrm{V}}_{\mathrm{m}}$ < 22.4 L
3. ${\mathrm{V}}_{\mathrm{m}}$ = 22.4 L
4. ${\mathrm{V}}_{\mathrm{m}}$ = 44.8 L

The conditions at which real gas would behave ideally is-
1. At high temperature and low pressure.
2. At low temperature and high pressure.
3. At high temperature and high pressure.
4. At low temperature and low pressure .

If pressure is in atmosphere and volume in dm³ , then the unit of 'a' is-
1. $\mathrm{atm}$ ${\mathrm{dm}}^6$ ${\mathrm{mol}}^{-2}$
2. $\mathrm{atm}$ ${\mathrm{dm}}^4$ ${\mathrm{mol}}^{-2}$
3. $\mathrm{atm}$ ${\mathrm{dm}}^3$ ${\mathrm{mol}}^{-3}$
4. ${\mathrm{atm}}^{-1}$ ${\mathrm{dm}}^4$ ${\mathrm{mol}}^{-2}$

A = \(\frac{pV^{2} T^{2}}{n}\) 
The SI unit for the quantity A is -
1. \(N   m^{2}   K^{2}   mol^{- 1}\)
2. \(N   m^{4}   K   mol^{- 1}\)
3. \(N   m^{2}   K^{3}   mol^{- 1}\) 
4. \(N   m^{4}   K^{2} mol^{- 1}\)

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

From the above data, the order of liquefaction of the given gases is-
(write the order from the gas liquefying first)
1. ${\mathrm{H}}_2,$ $\mathrm{He},$ ${\mathrm{O}}_2,$ ${\mathrm{N}}_2$
2. $\mathrm{He},$ ${\mathrm{O}}_2,$ ${\mathrm{H}}_2,$ ${\mathrm{N}}_2$
3. ${\mathrm{N}}_2,$ ${\mathrm{O}}_2,$ $\mathrm{He,}$ ${\mathrm{H}}_2$
4. ${\mathrm{O}}_2,$ ${\mathrm{N}}_2,$ ${\mathrm{H}}_2,$ $\mathrm{He}$

The SI unit of viscosity coefficient $\left(\mathrm{\eta }\right)$ is-
1. Pascal
2. Nsm^-2
3. km^-2s
4. Nm^-2

Increase in kinetic energy can overcome intermolecular forces of attraction. How will increase in temperature effect the viscosity of liquid-
1. Increase
2. No effect
3. Decrease
4. No regular pattern will be followed

With increase in temperature the surface tension of a liquid will:
1. Remains same
2. Decreases
3. Increases
4. No regular pattern is followed