Diffusion of Gases

Q.

Which gas has the lowest rate of diffusion?

1. ${\mathrm{H}}_2$

2. ${\mathrm{N}}_2$

3. ${\mathrm{F}}_2$

4. ${\mathrm{O}}_2$

Q.

Spreading of fragrance of a burning incense stick in a room shows that:

1. particles of matter have spaces between them.

2. particles of matter attract each other.

3. particles of matter are constantly moving.

4. particles of matter have smell.

Q.

Can the solids, liquids and gases diffuse into liquids?

Q.

The smell of hot sizzling food reaches several metres away, but to get the smell from cold food, we have to go close. Which of the following reason suits the best?

1. Lower the temperature, higher the kinetic energy of food particles

2. Higher the temperature, higher the kinetic energy of food particles

3. Higher the temperature, lower the kinetic energy of the food particles

4. Kinetic energy of food particles changes irrespective to temperature

Q.

Why does the process of diffusion in gases take place very fast?

Q. In plasma state the molecules, are tightly or loosely packed?

Q.

The gas ………………….. into other gases very fast.

Q.

Why is the rate of diffusion of liquids higher than that of solids?

Q. Assertion :Snow is better insulator than ice. Reason: Snow contain air packet and air is good insulator of heat.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. As we increase the temperature, the kinetic energy of the particles increases.

1. False
2. True

Q. Which of the following is most likely to diffuse in air?

1. Wood
2. Oil
3. Ice
4. Perfume fragrance

Q.

Predict true or false:

Gases have highest rate of diffusion among all the three states of matter.

1. True
2. False

Q.

Which of the following pair will exhibit diffusion?

1. Sulphur powder & sugar

2. Tea bag & hot water

3. Rubber & iron particles

4. Salt and sand

Q.

How does the rate of diffusion increase with increase in the temperature of a substance?

Q.

Gases have highest rate of diffusion among all the three states of matter.

1. True

2. False

Q. As we increase the temperature, the rate of diffusion .

1. increases
2. decreases
3. does not change.

Q.

The smell of hot sizzling food reaches us several meters away. However, it is not so in case the food is cold. Explain.