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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. The particles of a gas can be described as

Moving randomly in all directions

Only moving outwards in direction

Rising upwards

Vibrating about defined position

Question 1 of 20

Question 2 of 20

2. When steam condenses, the particles

Shrink to a smaller size

Vibrate about fixed positions

Lose energy to their surroundings

Move further apart

Question 2 of 20

Question 3 of 20

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

8.3143 Nm K⁻¹ mole⁻¹

0.0821 dm³ atm K⁻¹ mole⁻¹

None of these

8.3413 Nm K⁻¹ mole⁻¹

Question 3 of 20

Question 4 of 20

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

N₂

NH₃

Question 4 of 20

Question 5 of 20

5. Deep sea diver’s tank contains

None of these

50% N₂ + 50% O₂

96% N₂ + 4% O₂

4% N₂ + 96% O₂

Question 5 of 20

Question 6 of 20

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

Impure water at 102°C

Steam at 100°C

Water at 0°C

Water

Question 6 of 20

Question 7 of 20

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

Air can be readily compressed

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.

Question 7 of 20

Question 8 of 20

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

1:√4

1:4

4:1

2:32

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

A small energy change

High energy change

None of these

Question 9 of 20

Question 10 of 20

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

Bubbles rising in a beaker of boiling water.

Water spreading out on the surface of a table.

Steam condensing on a cold window.

The spreading of the smell of flowers in a garden.

Question 10 of 20

Question 11 of 20

11. 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:

Nitrogen is an un-reactive gas.

Both gases are diatomic.

The two gases have equal density

Both gases are soluble in H₂O

Question 11 of 20

Question 12 of 20

12. 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

Both are denser than air.

Their molecules contain carbon

Question 12 of 20

Question 13 of 20

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

Sublimation

Boiling

Diffusion

Evaporation

Question 13 of 20

Question 14 of 20

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

Are condensed into solid

Are melted from solid to liquid state

Are mixed with other molecules at low temperature

Are frozen into solid

Question 14 of 20

Question 15 of 20

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

H₂

NH₃

H₂S

SO₂

Question 15 of 20

Question 16 of 20

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

Equal to

Less than

Greater than

None of these

Question 16 of 20

Question 17 of 20

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

Cooling

Solidification

Heating

Liquefaction

Question 17 of 20

Question 18 of 20

18. 760 torr are equal to Pascal.

1.01325 Pascal

760 Pascal

101324 Pascal

One Pascal

Question 18 of 20

Question 19 of 20

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

44 dm³

11.2 dm³

22.4 dm³

33.6 dm³

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

Test By Subject	Punjab
Test By Topics	11th Class Chemistry

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Punjab 11th Class Chemistry Chapter 3 Gases Mcqs Test Online

Chemistry Chapter 3 Gases Mcqs Test Online Punjab 9th Class

Chemistry

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