1. Which statement about particles of solid is not correct

a. They move at greater speeds
b. They are arranged in regular patterns
c. There is little space between particles
d. Force of attraction between particles are very strong

2. The boiling point of some elements are given below Argon = -186⁰C Nitrogen =-196^oC oxygen = -183⁰C Xenon =-108⁰C . A mixture of above gases at -210⁰C was heated by 20⁰C. Which of the following elements will still be in liquid state?

a. oxygen only
b. argon oxygen and xenon
c. xenon only
d. oxygen and xenon

3. Which among following has highest boiling and melting point

a. solid
b. liquid
c. gas
d. plasma

4. In which of the following processes speed of particle decreases?

a. melting
b. boiling
c. sublimation
d. condensation

5. A liquid boils when its vapor pressure becomes equal to

a. 760cmHg
b. 1Pa
c. 101.325kPa
d. 0.1 atm

6. Acetone has characteristic fragrant odour and is used to make finger nail polishes. It melts at -94^oC and boils at 56^oC. What is physical state of acetone at 25^oC and 1atm

a. solid
b. liquid
c. gas
d. cannot be determined

7. Water normally boils at 100oC but it is possible to boil water at room temperature. What variable would you have to change to do this

a. increase external pressure
b. decrease external pressure
c. decrease temperature
d. none

8. Bromine has melting point of -7oC and and boiling point of 59oC. What is physical state of bromine at 100oC

a. gas
b. liquid
c. solid
d. cannot be predicted

9. Which is not the property of crystalline solids

a. have well defined shape
b. have orderly arrangement of particles
c. have repeating 3D arrangement of particles
d. are generally soft