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

They are both gases

They have the same relative molecular mass

Both are denser than air.

Their molecules contain carbon

Question 1 of 20

Question 2 of 20

2. The particles of a gas can be described as

Rising upwards

Only moving outwards in direction

Vibrating about defined position

Moving randomly in all directions

Question 2 of 20

Question 3 of 20

3. When steam condenses, the particles

Lose energy to their surroundings

Vibrate about fixed positions

Shrink to a smaller size

Move further apart

Question 3 of 20

Question 4 of 20

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

33.6 dm³

22.4 dm³

44 dm³

11.2 dm³

Question 4 of 20

Question 5 of 20

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

H₂S

H₂

SO₂

NH₃

Question 5 of 20

Question 6 of 20

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

1:√4

4:1

2:32

1:4

Question 6 of 20

Question 7 of 20

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

None of these

Greater than

Less than

Equal to

Question 7 of 20

Question 8 of 20

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

NH₃

N₂

Question 8 of 20

Question 9 of 20

9. 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:

The two gases have equal density

Both gases are soluble in H₂O

Nitrogen is an un-reactive gas.

Both gases are diatomic.

Question 9 of 20

Question 10 of 20

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

Air can be readily compressed

Many elements conduct electricity.

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

Question 10 of 20

Question 11 of 20

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

Cooling

Solidification

Liquefaction

Heating

Question 11 of 20

Question 12 of 20

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

Are mixed with other molecules at low temperature

Are melted from solid to liquid state

Are condensed into solid

Are frozen into solid

Question 12 of 20

Question 13 of 20

13. 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 13 of 20

Question 14 of 20

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

High energy change

A small energy change

No energy change

None of these

Question 14 of 20

Question 15 of 20

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

Diffusion

Boiling

Sublimation

Evaporation

Question 15 of 20

Question 16 of 20

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

Water at 0°C

Steam at 100°C

Water

Impure water at 102°C

Question 16 of 20

Question 17 of 20

17. 760 torr are equal to Pascal.

101324 Pascal

One Pascal

1.01325 Pascal

760 Pascal

Question 17 of 20

Question 18 of 20

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

The spreading of the smell of flowers in a garden.

Water spreading out on the surface of a table.

Bubbles rising in a beaker of boiling water.

Steam condensing on a cold window.

Question 18 of 20

Question 19 of 20

19. Deep sea diver’s tank contains

50% N₂ + 50% O₂

None of these

4% N₂ + 96% O₂

96% N₂ + 4% O₂

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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