Скачать или смотреть is matter around us pure class 9 very important questions final part

1 Mark Questions:

QUESTIONS

1. What is meant by pure substance?

2. What is meant by mass percentage of solution?

3. Name the process of separation of miscible liquids.

4. Arrange the following in decreasing order of size of the particles. True Solution, Suspension, Colloid.

5. *Give an example of an aqueous solution in which gas is dissolved.

6. Name the dispersion medium and dispersed phase in the white material inside an egg.

7. What happens when hot saturated solution is cooled?

8. How would you separate a mixture of chalk and water?

9. *How much water should be added to 15 grams of salt to obtain 15 % salt solution?

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What type of mixtures are separated by technique of crystallization ?

2 Marks Questions:

1. Which of the following materials fall in the category of a pure substance?
a) ice

b) Milk

c) Iron

d) Hydrochloric acid

e) Calcium oxide

f) Mercury

g) bricks

h) Wood.

2. What do you understand by saturated solution and unsaturated solution?

3. *What do you observe when sunlight passes through a dense forest?

List two points of differences between homogeneous and heterogeneous mixtures.

5. State the difference between aqueous & non aqueous solution.

6. Which of the following will show "Tyndal Effect" & Why ?

a) Salt Solution b) Milk c) Copper Sulphate Solution d) Starch Solution

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7. *How can we obtain pure copper sulphate from an impure sample?

8. Give two differences between compounds and mixtures.

9. Why is hydrogen considered as element ? Give two reasons.

10. Why water is a compound and not a mixture?

3 Marks Questions:

1. Classify the following into elements, compounds and mixtures:

a) Sodium b) Soil c) Sugar solution

e) Calcium carbonate

f) Tin

g) Silicon

h) Coal

i) Air j) Soap

d) Silver

k) Methane

I) Carbon dioxide

m) Blood.

b) Rusting of iron

c) Mixing of iron fillings and sand

g) Burning of a candle.

2. Give any two applications of centrifugation.

3. Which of the following is chemical change?

a) Growth of a plant

d) Cooking of food e) Digestion of food f) Freezing of water

4. *State the difference between simple distillation & fractional distillation.

5.* A solution contains 40 ml of ethanol mixed with 100 ml of water. Calculate the concentration in terms of volume by volume percentage


5 Marks Questions:

1.

*What is meant by Tyndall effect? What is its cause? Illustrate with example.


2. How would you separate the mixture containing sulphur and sand ?

3. What is crystallization? Give its two applications.

4. How are sol, solution and suspension different from each other?

5. How do we obtain coloured components, i.e. dye from Blue/Black ________------------------_____________--------------_______


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