Punjab 11th Class Chemistry Chapter 3 Gases Mcqs Test Online

Chemistry Chapter 3 Gases Mcqs Test Online Punjab 9th Class

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Question 1 of 20

Chemistry

1. Which of the following is an example of diffusion?

The spreading of the smell of flowers in a garden.

Steam condensing on a cold window.

Bubbles rising in a beaker of boiling water.

Water spreading out on the surface of a table.

Question 1 of 20

Question 2 of 20

2. One heating direct conversion of solid in to gas is called

Sublimation

Diffusion

Evaporation

Boiling

Question 2 of 20

Question 3 of 20

3. In which of the following are the particles the most disordered.

Water at 0°C

Water

Impure water at 102°C

Steam at 100°C

Question 3 of 20

Question 4 of 20

4. Deep sea diver’s tank contains

96% N₂ + 4% O₂

None of these

50% N₂ + 50% O₂

4% N₂ + 96% O₂

Question 4 of 20

Question 5 of 20

5. In S.I units, the value of R is

0.0821 dm³ atm K⁻¹ mole⁻¹

8.3143 Nm K⁻¹ mole⁻¹

None of these

8.3413 Nm K⁻¹ mole⁻¹

Question 5 of 20

Question 6 of 20

6. When a large beaker full of N₂ is inverted over a porous pot containing Com the water level in the specified apparatus does not change. What is the reason for this:

Both gases are soluble in H₂O

Nitrogen is an un-reactive gas.

The two gases have equal density

Both gases are diatomic.

Question 6 of 20

Question 7 of 20

7. According to Kinetic Molecular theory K.E of Molecules increase when they

Are mixed with other molecules at low temperature

Are frozen into solid

Are melted from solid to liquid state

Are condensed into solid

Question 7 of 20

Question 8 of 20

8. When steam condenses, the particles

Move further apart

Lose energy to their surroundings

Vibrate about fixed positions

Shrink to a smaller size

Question 8 of 20

Question 9 of 20

9. According to the kinetic theory of gases, the molecular collisions are elastic. Such collisions cause

No energy change

None of these

High energy change

A small energy change

Question 9 of 20

Question 10 of 20

10. The number of molecules of 4 g H₂ are _________ number of molecules of 56 g of N₂.

Greater than

Less than

Equal to

None of these

Question 10 of 20

Question 11 of 20

11. What volume of gas would one mole of hydrogen occupy at S.T.P?

11.2 dm³

44 dm³

22.4 dm³

33.6 dm³

Question 11 of 20

Question 12 of 20

12. 760 torr are equal to Pascal.

101324 Pascal

760 Pascal

1.01325 Pascal

One Pascal

Question 12 of 20

Question 13 of 20

13. When compressed hydrogen is allowed to expand rapidly, it causes

Cooling

Heating

Liquefaction

Solidification

Question 13 of 20

Question 14 of 20

14. Which statement provides the best evidence that matter may exist as tiny particles moving at “random motion”.

A small mass of water produces a much larger volume of steam

If a bottle of ether is opened, the smell is quickly detected in all parts of the room

Many elements conduct electricity.

Air can be readily compressed

Question 14 of 20

Question 15 of 20

15. Which of the following gases has the lowest density under room conditions

N₂

NH₃

Question 15 of 20

Question 16 of 20

16. Which gas is more ideal at S.T.P.

H₂

SO₂

H₂S

NH₃

Question 16 of 20

Question 17 of 20

17. According to Graham’s Law of diffusion, the rate of diffusion of H₂ and O₂ has the ratio

2:32

1:4

4:1

1:√4

Question 17 of 20

Question 18 of 20

18. Which statement explains why the compounds propane and CO₂ diffuse at the same rate?

They have the same relative molecular mass

They are both gases

Their molecules contain carbon

Both are denser than air.

Question 18 of 20

Question 19 of 20

19. The particles of a gas can be described as

Only moving outwards in direction

Vibrating about defined position

Rising upwards

Moving randomly in all directions

Question 19 of 20

Question 20 of 20

Abbreviations

20. Which of these changes would speed up the rate of diffusion the most.

No	Mass of Particle	Temperature of Surroundings
A	Decrease	Decrease
B	Decrease	Increase
C	Increase	Increase
D	Increase	Decrease

Question 20 of 20

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