1. When compressed hydrogen is allowed to expand rapidly , it causes
a. cooling
b. heating
c. liquefaction
d.solidification
2. 760torr is equal to…. Pascal
a. 760Pa
b. 101325Pa
c. 1.01325Pa
d. 1Pa
3. The number of molecules in 4g of H2 are ….. number of molecules of 56g of N2
a. equal to
b. less than
c. greater than
d. none
4. According to kinetic theory of gases, the molecular collision are elastic. Such collision causes
a. no energy change
b. small energy change
c. high energy change
d. none of these
5. What volume would one mole of hydrogen occupy at STP
a. 11.2dm3
b. 22.4dm3
c. 33.6dm3
d. 44dm3
6. According to Grahams law of diffusion the rate of diffusion of H2 and O2 has the ratio
a. 1:4
b. 1: 6
c. 4:1
d.2 :32
7. Deep sea divers’s tank contains
a. 96% He + 4% O2
b. 96% N2 + 4% O
c. 96% O2 + 4% N2
d. 50% O2 + 4% N2
8. In SI unit, the value of R is
a. 8.3413 Nm/Kmol
b. 8.3413 atmdm3/Kmol
c. 0.0821 atmdm3/Kmol
d. none of these
9. According to kinetic molecular theory , kinetic energy of molecules increases when they
a. are mixed with other molecules at low temperature
b. are frozen into solid
c. are condensed into liquid
d. are melted from solid to liquid state
10. Which gas is more ideal at STP
a. SO2
b. H2S
c. NH3
d. H2
11. On heating direct conversion from solid to gas is called
a. evaporation
b. sublimation
c. diffusion
d. boiling
12. In which of the following are particles the most distorted
a. water
b. steam at 100oC
c. impure water at 102oC
d. water at 0oC
13. When steam condenses, the particles
a. shrink to a smaller size
b. lose energy to their surroundings
c. move further apart
d. vibrate about fixed positions
14. The particles of a gas can be described as
a. only moving outwards in direction
b. vibrating about defined position
c. rising upwards
d. moving randomly in all directions
15. Which of following gas has lowest density under room conditions
a. CO
b. N2
c. Ne
d. O2
16.Which statement provides the best evidence that matter may exist as tiny particles moving at ” random motion”
a. many elements conduct electricity
b. air can be readily compressed
c. a small mass of water produces a larger volume of steam
d. if a bottle of ether is opened , the smell is quickly detected in all parts of room
17. Which of following is an example of diffusion
a. bubbles rising in a beaker of boiling water
b. steam condensing on cold window
c. water spreading out on the surface of a table
d. The spreading of smell of flowers in a garden
18. Which statements explains why the compound propane and CO2 diffuse at the same rate
a. they are both gases
b. their molecule contain carbon
c. they have same relative molecular mass
d. both are denser than air
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