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Punjab 11th Class Chemistry Chapter 3 Gases Mcqs Test Online

Chemistry Chapter 3 Gases Mcqs Test Online Punjab 9th Class

Question 1 of 20

Chemistry

1. When steam condenses, the particles

Vibrate about fixed positions

Shrink to a smaller size

Move further apart

Lose energy to their surroundings

Question 1 of 20

Question 2 of 20

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

None of these

Equal to

Less than

Greater than

Question 2 of 20

Question 3 of 20

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

Solidification

Liquefaction

Heating

Cooling

Question 3 of 20

Question 4 of 20

4. 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 diatomic.

The two gases have equal density

Nitrogen is an un-reactive gas.

Both gases are soluble in H₂O

Question 4 of 20

Question 5 of 20

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

Are condensed into solid

Are frozen into solid

Are melted from solid to liquid state

Are mixed with other molecules at low temperature

Question 5 of 20

Question 6 of 20

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

NH₃

SO₂

H₂

H₂S

Question 6 of 20

Question 7 of 20

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

22.4 dm³

33.6 dm³

44 dm³

11.2 dm³

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

2:32

4:1

1:4

1:√4

Question 8 of 20

Question 9 of 20

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

Diffusion

Sublimation

Boiling

Evaporation

Question 9 of 20

Question 10 of 20

10. Deep sea diver’s tank contains

96% N₂ + 4% O₂

4% N₂ + 96% O₂

None of these

50% N₂ + 50% O₂

Question 10 of 20

Question 11 of 20

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

8.3143 Nm K⁻¹ mole⁻¹

None of these

0.0821 dm³ atm K⁻¹ mole⁻¹

8.3413 Nm K⁻¹ mole⁻¹

Question 11 of 20

Question 12 of 20

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

Steam condensing on a cold window.

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.

Question 12 of 20

Question 13 of 20

13. The particles of a gas can be described as

Rising upwards

Vibrating about defined position

Only moving outwards in direction

Moving randomly in all directions

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”.

Many elements conduct electricity.

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

Air can be readily compressed

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

Question 14 of 20

Question 15 of 20

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

Both are denser than air.

They have the same relative molecular mass

Their molecules contain carbon

They are both gases

Question 15 of 20

Question 16 of 20

16. 760 torr are equal to Pascal.

101324 Pascal

1.01325 Pascal

760 Pascal

One Pascal

Question 16 of 20

Question 17 of 20

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

N₂

NH₃

Question 17 of 20

Question 18 of 20

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

A small energy change

None of these

High energy change

No energy change

Question 18 of 20

Question 19 of 20

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

Impure water at 102°C

Water

Steam at 100°C

Water at 0°C

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

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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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