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

None of these

High energy change

No energy change

A small energy change

Question 1 of 20

Question 2 of 20

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

Solidification

Heating

Liquefaction

Cooling

Question 2 of 20

Question 3 of 20

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

They have the same relative molecular mass

Both are denser than air.

They are both gases

Their molecules contain carbon

Question 3 of 20

Question 4 of 20

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

0.0821 dm³ atm K⁻¹ mole⁻¹

8.3413 Nm K⁻¹ mole⁻¹

8.3143 Nm K⁻¹ mole⁻¹

None of these

Question 4 of 20

Question 5 of 20

5. 760 torr are equal to Pascal.

760 Pascal

101324 Pascal

One Pascal

1.01325 Pascal

Question 5 of 20

Question 6 of 20

6. Deep sea diver’s tank contains

96% N₂ + 4% O₂

50% N₂ + 50% O₂

4% N₂ + 96% O₂

None of these

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

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 7 of 20

Question 8 of 20

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

Impure water at 102°C

Water at 0°C

Water

Steam at 100°C

Question 8 of 20

Question 9 of 20

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

NH₃

N₂

Question 9 of 20

Question 10 of 20

10. 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 10 of 20

Question 11 of 20

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

Are condensed into solid

Are melted from solid to liquid state

Are frozen into solid

Are mixed with other molecules at low temperature

Question 11 of 20

Question 12 of 20

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

H₂

H₂S

NH₃

SO₂

Question 12 of 20

Question 13 of 20

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

Water spreading out on the surface of a table.

The spreading of the smell of flowers in a garden.

Bubbles rising in a beaker of boiling water.

Steam condensing on a cold window.

Question 13 of 20

Question 14 of 20

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

2:32

1:4

1:√4

4:1

Question 14 of 20

Question 15 of 20

15. 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.

Both gases are soluble in H₂O

Nitrogen is an un-reactive gas.

The two gases have equal density

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.

Greater than

None of these

Less than

Equal to

Question 16 of 20

Question 17 of 20

17. The particles of a gas can be described as

Only moving outwards in direction

Moving randomly in all directions

Rising upwards

Vibrating about defined position

Question 17 of 20

Question 18 of 20

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

Evaporation

Diffusion

Sublimation

Boiling

Question 18 of 20

Question 19 of 20

19. When steam condenses, the particles

Shrink to a smaller size

Vibrate about fixed positions

Move further apart

Lose energy to their surroundings

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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