The spherical shape of rain droplets is due to-

1. Viscosity

2. surface tension

3. Critical phenomenon

4. Pressure

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. ${\mathrm{O}}_2,$ ${\mathrm{N}}_2,$ ${\mathrm{H}}_2,$ $\mathrm{He}$

With increase in temperature the surface tension of a liquid will:

1. Remains same

2. Decreases

3. Increases

4. No regular pattern is followed

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

 Among water, ether, and acetone, water has the maximum boiling point and ether has the minimum boiling point. The correct order of vapour pressure of water, acetone and ether at $30°\mathrm{C}$ is-

1. Water<ether<acetone

2. Water<acetone<ether

3. Ether<acetone<water

4. Acetone<ether<water

The SI unit of viscosity coefficient $\left(\mathrm{\eta }\right)$ is-

1. Pascal

2. Nsm^-2

3. km^-2s

4. Nm^-2

Atmospheric pressure recorded in different cities are as follows

The liquid will boil first at -

1. Shimla

2. Bangalore

3. Delhi

4. Mumbai

As per Charles's law ,–273° C is the lowest possible temperature because:

Maximum deviation from ideal gas is shown by-

1. H_2(g)   

2. N_2(g)

3. CH_4(g)

4. NH_3(g)

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

1. ${\mathrm{a}}_{{\mathrm{NH}}_3}> {\mathrm{a}}_{{\mathrm{N}}_2}, {\mathrm{b}}_{{\mathrm{NH}}_3}< {\mathrm{b}}_{{\mathrm{N}}_2}$

2. ${\mathrm{a}}_{{\mathrm{NH}}_3}< {\mathrm{a}}_{{\mathrm{N}}_2}, {\mathrm{b}}_{{\mathrm{NH}}_3}< {\mathrm{b}}_{{\mathrm{N}}_2}$

3. ${\mathrm{a}}_{{\mathrm{NH}}_3}> {\mathrm{a}}_{{\mathrm{N}}_2}, {\mathrm{b}}_{{\mathrm{NH}}_3}> {\mathrm{b}}_{{\mathrm{N}}_2}$

4. ${\mathrm{a}}_{{\mathrm{NH}}_3} < {\mathrm{a}}_{{\mathrm{N}}_2}, {\mathrm{b}}_{{\mathrm{NH}}_3}> {\mathrm{b}}_{{\mathrm{N}}_2}$