Gaseous - Liquid - Solid States- Multiple Choice Questions

1. Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

a. same as that of a hydrogen molecule
b. two times that of a hydrogen molecule
c. four times that of a hydrogen molecule
d. half that of a hydrogen molecule
(JEE 1982)

Answer: (a)

2. among the following, the molecule that is linear is

a. CO2
b. NO2
c. SO2
d. ClO2
(JEE 1982)

ans : (a)

CO2 is a linear molecule

3. A liquid is in equilibrium with its vapour at its boiling point. On average, the molecules in the two phases have equal:

a. inter-molecular forces
b. potential energy
c. kinetic energy
d. temperature
(JEE 1984)

Answer (d)

4. Rate of diffusion of a gas is:

a. directly proportional to its density
b. directly proportional t its molecular weight
c. directly proportional to the square root of its molecular weight
d. indirectly proportional to the square root of its molecular weight
(JEE 1985)

Answer (d)

5. the average velocity of an ideal gas molecule at 27°C is 0.3 m/s. the average speed at 927°C will be:

a. 0.6 m/s
b. 0.3 m/s
c. 0.9 m/s
d. 3.0 m/s
(JEE 1986)

Answer: (a)