IS MATTER AROUND US PURE

1	Size of colloidal particles in a solution is: (a) more than 100 nm (b) less than 1 nm (c) between 1 to 100 nm (d) between 100 to 1000 nm	1
2	A solution contains 38 g of common salt in 362 g of water. The concentration of this solution is: (a) 9.5% (b) 11.7 % (c) 10.49 % (d) 10.85 %	1
3	Which of the following is correctly matched? (a) Emulsion-mud (b) Aerosol-jelly (c) Sol-milk of magnesia (d) Gel-face cream	1
4	A mixture of sulphur and carbon disulphide is: (a) heterogeneous and shows Tyndall effect (b) heterogeneous and does not show Tyndall effect (c) homogeneous and shows Tyndall effect (d) homogeneous and does not show Tyndall effect	1
5	Who was the first scientist to use the term element? (a) Robert Boyle (b) Dalton (c) Lavoisier (d) Charles	1
6	Which of the following is a metalloid? (a) Germanium (b) Carbon (c) Gallium (d) Sodium	1
7	Which of the following is not a compound? (a) Marble (b) Quicklime (c) Brass (d) Washing soda	1
8	Which type of mixture can be separated by filtration? (a) Colloid (b) Suspension (c) True solution (d) All of these	1
9	Component present in larger amount in solution is known as: (a) Dispersed phase (b) Solute (c) Solvent (d) None of these	1
10	Which of the following solutions shows Tyndall effect? (a) A solution of common salt (b) Sugar solution (c) Lemonade (d) Starch solution	1

ASSERTION AND REASON QUESTIONS

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

(b) Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of the Assertion (A).

(c) Assertion (A) is true, and Reason (R) is false.

(d) Assertion (A) is false, and Reason (R) True.

11	Assertion (A): A solution of sugar in a glass of water is homogeneous. Reason (R): A solution having non-uniform composition is homogeneous.	1
12	Assertion (A): On dissolving chalk powder in water, a suspension is obtained. Reason (R): The particles of a suspension can be seen by the naked eye.	1
13	Assertion (A): Interconversion of states of matter is considered a physical change. Reason (R): Interconversion of states of matter takes place without change in composition.	1
14	Assertion (A): All homogeneous mixtures are pure substances. Reason (R): Alloys are homogeneous mixtures of solids.	1

VERY SHORT ANSWER QUESTIONS

15	State any one difference between puro and impure substances.	2
16	Smoke and clouds both are aerosols. In what way are they different?	2
17	Define the term colloidal solution.	2
18	Identify the heterogeneous mixture from the following: Air, soda water, soap solution, brass.	2
19	Define the term suspension.	2

SHORT ANSWER TYPE QUESTIONS

20	List the points of differences between homogeneous and heterogeneous mixtures.	3
21	Tabulate the differences between true solution and colloid. Give two points of difference.	3
22	Define a solution. Give an example of (i) gas in liquid solution, (ii) gas in gas solution.	3
23	(i) Identify colloids from the following: Copper sulphate solution, milk, smoke, muddy water, butter, sugar solution, face cream, lemonade. (ii) Identify the dispersed phase and dispersing medium in the following examples of colloids: (a) Fog, (b) Cheese, (c) Coloured gemstone.	3
24	State one instance where water undergoes a physical change and one in which it undergoes a chemical change.	3
25	On heating calcium carbonate gets converted into calcium oxide and carbon dioxide. (i) Is this a physical or a chemical change? (ii) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.	3
26	Write any three physical properties each of metals and non-metals.	3

LONG ANSWER TYPE QUESTIONS

27	Tabulate the differences between compound and mixture.	5
28	Differentiate between true solution, suspension and colloidal solution.	5
29	(i) Write one point of difference between concentration and solubility. (ii) What is the effect of temperature on the rate of solubility?	5
30	(i) What is the effect of change of temperature on the solubility of a salt? (ii) How many litres of 15% (mass/volume) sugar solution would it take to get 75 g of sugar? (iii) Identify colloid from the following mixtures: Muddy water, sugar in walk, ink, blood, soda water, foam (iv) Why copper sulphate solution in water does not show Tyndall effect but mixture of water and milk shows?	5
31	Classify each of the following, as a physical or a chemical change. Give reasons. (i) Drying of a shirt in the sun. (ii) Rising of hot air over a radiator. (iii) Burning of kerosene in a lantern. (iv) Change in the colour of black tea on adding lemon juice to it. (v) Churning of milk cream to get butter.	5
32	Why is the inter-conversion of states of matter considered as a physical change?	5
33	Distinguish between physical change and chemical change.	5

CASE BASED STUDY QUESTIONS

Read the given passage carefully and give the answer of the following questions:

During a science exhibition, students displayed different materials such as iron nails, distilled water, milk, and soft drinks. They were asked to classify each as an element, compound, or mixture.

1. Classify the following:

Iron nails

Distilled water

Milk

Soft drink

2. Which of these is a homogeneous mixture?

3. What makes milk a colloidal solution?

4. Why is distilled water called a pure substance?

5. Is soft drink a compound or a mixture? Justify.

Read the given passage carefully and give the answer of the following questions:

Neha was given three white powders – sugar, chalk powder, and salt – in her lab practical. She had to identify them without tasting. She dissolved them in water and observed their solubility and whether the solution was clear or not.

1. Which of the three substances will form a true solution in water?

2. What type of mixture is formed by chalk powder in water?

3. How can Neha confirm the presence of salt in water?

4. What is the difference between a solution, suspension, and colloid?

5. Which of the three powders will not pass through filter paper?

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