Welcome to the ultimate practice zone for Class 9 students!
Our Chapter 2 Science Mock Tests are designed to help you revise, practice, and test your understanding of all key topics — from fundamental concepts to tricky application-based questions.

1.

 Which of the following is a colloidal solution?

 
 
 
 

2.

 Which of the following has the highest solubility at 313 K?

 
 
 
 

3. In the following Questions, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: A saturated solution becomes super saturated on cooling.
Reason: It is because solubility decreases with decrease in temperature.
 
 
 
 

4. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Volatile solvents have low boiling points.
Reason: They have strong forces of attraction between particles.
 
 
 
 

5. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Iodine is lustrous.
Reason: Iodine is non-metal.
 
 
 
 

6. Which of the following is/are chemical changes?

 
 
 
 

7.

 The particles of colloidal solution can be separated by

 
 
 
 

8. In the following Questions, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: 5 mL of alcohol is dissolved in 75 mL of water. Its volume/volume percentage is 6.25%.
Reason: Volume changes with change in temperature.
 
 
 
 

9.

 Which of the following statements is not correct?

 
 
 
 

10.

 40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is

 
 
 
 

11. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Purity is very important in new medical drug or a flavouring agent for food.
Reason: It is because you must make sure it contains nothing that could harm people.
 
 
 
 

12.

 A pure substance/element contains

 
 
 
 

13. A student listed some items as shown.

(i) Methane
(ii) Silicon
(iii) Acetic acid
(iv) Hydrogen
Which substances cannot be broken into simpler substances? [CBSE T.E.R.M.*]
 
 
 
 

14. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Dust particle in air form aerosol.
Reason: Dust particles form dispersion medium and air is dispersed phase.
 
 
 
 

15. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Sugar is more soluble in hot water than cold water.
Reason: Solubility of sugar increases with increase in temperature.
 
 
 
 

16.

 Which of the following is the most stable ?

 
 
 
 

17. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

 
 
 
 

18. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Medicine are easily absorbed by our body in colloidal form.
Reason: It is because they have large surface area and therefore, absorbed easily.
 
 
 
 

19.

 Which of the following has the highest solubility at 293 K?

 
 
 
 

20. In the following Questions, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Silver bromide compound is made of silver and bromine elements.
Reason: Silver bromide is a pure substance.
 
 
 
 

21. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Compounds are formed by chemical changes.
Reason: Mixtures are formed by physical changes.
 
 
 
 

22. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Vaccines must be safe and free from harmful effects.
Reason: Nasel corona vaccines has been approved by India Govt.
 
 
 
 

23.

 Which of the following is a chemical change?

 
 
 
 

24.

 Which of the following is a physical change?

 
 
 
 

25. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: A pure substance has no particles of any other substance mixed with it.
Reason: Pure substance has fixed melting and boiling point.
 
 
 
 

26.

 The size of particles of true solutions is

 
 
 
 

27. In the following Question, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

Assertion: Water sample freezes around –0.5°C and boils around 101°C.
Reason: So it is not pure.
 
 
 
 

28.

 Which of the following is not a mixture ?

 
 
 
 

29. In the following Questions, the Assertion (A) and Reason (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:

 

Assertion: Boiling point of sea water is more than 100°C.
Reason: Soluble impurities increase the boiling point of liquid.
 
 
 
 

30. When you light a piece of magnesium ribbon, it burns with a dazzling light. A white ash is formed. What signs are these that a chemical changes has taken place?

 
 
 
 

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