# NCERT solutions for Science Class 9 chapter 2 - Is Matter around us Pure [Latest edition]

## Solutions for Chapter 2: Is Matter around us Pure

Below listed, you can find solutions for Chapter 2 of CBSE NCERT for Science Class 9.

Intext QuestionsIntext QuestionsIntext QuestionsIntext QuestionsExercises
Intext Questions [Pages 12 - 15]

### NCERT solutions for Science Class 9 Chapter 2 Is Matter around us Pure Intext Questions [Pages 12 - 15]

Intext Questions | Q 1. | Page 12

Which of the following statements are true for pure substances ?

1. pure substances contain only one kind of particles
2. pure substances may be compounds or mixtures
3. pure substances have the same composition throughout
4. pure substances can be exemplified by all elements other than nickel
• (i) and (ii)

• (i) and (iii)

• (iii) and (iv)

• (ii) and (iii)

Intext Questions | Q 1 | Page 15

What is meant by a pure substance?

Intext Questions | Q 2 | Page 15

List the points of differences between homogeneous and heterogeneous mixtures with examples.

Intext Questions [Page 18]

### NCERT solutions for Science Class 9 Chapter 2 Is Matter around us Pure Intext Questions [Page 18]

Intext Questions | Q 1 | Page 18

Differentiate between homogeneous and heterogeneous mixtures with examples.

Intext Questions | Q 2 | Page 18

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

Intext Questions | Q 3 | Page 18

To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.

Intext Questions [Page 24]

### NCERT solutions for Science Class 9 Chapter 2 Is Matter around us Pure Intext Questions [Page 24]

Intext Questions | Q 1 | Page 24

How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?

Intext Questions | Q 2.1 | Page 24

Name the technique to separate butter from curd.

Intext Questions | Q 2.2 | Page 24

Name the technique to separate salt from sea-water.

Intext Questions | Q 2.3 | Page 24

Name the technique to separate camphor from salt

Intext Questions | Q 3 | Page 24

What type of mixtures is separated by the technique of crystallization?

Intext Questions [Page 24]

### NCERT solutions for Science Class 9 Chapter 2 Is Matter around us Pure Intext Questions [Page 24]

Intext Questions | Q 1.1 | Page 24

Classify the following as chemical or physical changes : Cutting of trees

Intext Questions | Q 1.2 | Page 24

Classify the following as chemical or physical changes: Melting of butter in a pan

Intext Questions | Q 1.3 | Page 24

Classify the following as chemical or physical changes:- Rusting of almirah

Intext Questions | Q 1.4 | Page 24

Classify the following as chemical or physical changes:- Boiling of water to form steam

Intext Questions | Q 1.5 | Page 24

Classify the following as chemical or physical changes:-

Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

Intext Questions | Q 1.6 | Page 24

Classify the following as chemical or physical changes:- Dissolving common salt in water

Intext Questions | Q 1.7 | Page 24

Classify the following as chemical or physical changes:- Making a fruit salad with raw fruits

Intext Questions | Q 1.8 | Page 24

Classify the following as chemical or physical changes:-Burning of paper and wood

Intext Questions | Q 2 | Page 24

Try segregating the things around you as pure substances or mixtures.

Exercises [Pages 28 - 30]

### NCERT solutions for Science Class 9 Chapter 2 Is Matter around us Pure Exercises [Pages 28 - 30]

Exercises | Q 1.01 | Page 28

Which separation techniques will you apply for the separation of the Sodium chloride from its solution in water.

Exercises | Q 1.02 | Page 28

Which separation techniques will you apply for the separation of the Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.

Exercises | Q 1.03 | Page 28

Which separation techniques will you apply for the separation of the Small pieces of metal in the engine oil of a car.

Exercises | Q 1.04 | Page 28

Which separation techniques will you apply for the separation of the Different pigments from an extract of flower petals.

Exercises | Q 1.05 | Page 28

Which separation techniques will you apply for the separation of the following?
Butter from curd.

Exercises | Q 1.06 | Page 28

Which separation techniques will you apply for the separation of the Oil from water.

Exercises | Q 1.07 | Page 28

Which separation techniques will you apply for the separation of the Tea leaves from tea.

Exercises | Q 1.08 | Page 28

Which separation techniques will you apply for the separation of the following?
Iron pins from sand.

Exercises | Q 1.09 | Page 28

Which separation techniques will you apply for the separation of the Wheat grains from husk.

Exercises | Q 1.1 | Page 28

Which separation techniques will you apply for the separation of the Fine mud particles suspended in water.

Exercises | Q 2 | Page 28

Write the steps you would use for making tea. Use the words: solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Exercises | Q 3 | Page 28

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below( results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

 Substance dissolved Temperature in K 283 293 313 333 353 Potassium nitrate 21 32 62 106 167 Sodium chloride 36 36 36 37 37 Potassium chloride 35 35 40 46 54 Ammonium chloride 24 37 41 55 66

(a)  What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

(b)  Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

(c)  Find the solubility of each salt at 293 K. What salt has the highest solubility at this temperature?

(d)  What is the effect of change of temperature on the solubility of a salt?

Exercises | Q 4.1 | Page 29

Explain the following giving example.
saturated solution

Exercises | Q 4.2 | Page 29

Explain the term Pure substance by giving examples.

Exercises | Q 4.3 | Page 29

Explain the term Colloid by giving examples.

Exercises | Q 4.4 | Page 29

Explain the following giving example:
Suspension

Exercises | Q 5 | Page 29

Classify each of the following as a homogeneous or heterogeneous mixture.

Soda water, wood, air, soil, vinegar, filtered tea

Exercises | Q 6 | Page 29

How would you confirm that a colourless liquid given to you is pure water?

Exercises | Q 7 | Page 29

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) Brick

(h) Wood

(i) Air

Exercises | Q 8 | Page 29

Identify the solutions among the following mixtures:-

(a) Soil

(b) Sea water

(c) Air

(d) Coal

(e) Soda water

Exercises | Q 9 | Page 29

Which of the following will show the “Tyndall effect”?

(a) Salt solution

(b) Milk

(c) Copper sulphate solution

(d) Starch solution

Exercises | Q 10 | Page 29

Classify the following into elements, compounds and mixtures:

(a) Sodium

(b) Soil

(c) Sugar solution

(d) Silver

(e) Calcium carbonate

(f) Tin

(g) Silicon

(h) Coal

(i) Air

(j) Soap

(k) Methane

(l) Carbon dioxide

(m) Blood

Exercises | Q 11 | Page 30

Which of the following are chemical changes?

(a) Growth of a plant

(b) Rusting of iron

(c) Mixing of iron fillings and sand

(d) Cooking of food

(e) Digestion of food

(f) Freezing of water

(g) Burning of candle

## Solutions for Chapter 2: Is Matter around us Pure

Intext QuestionsIntext QuestionsIntext QuestionsIntext QuestionsExercises

## NCERT solutions for Science Class 9 chapter 2 - Is Matter around us Pure

Shaalaa.com has the CBSE Mathematics Science Class 9 CBSE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT solutions for Mathematics Science Class 9 CBSE 2 (Is Matter around us Pure) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.

Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.

Concepts covered in Science Class 9 chapter 2 Is Matter around us Pure are Matter (Substance), Mixture, Solutions, Concentration of a Solution, Suspension Solution, Colloidal Solution, Evaporation Method, Compound, Types of Matter, Types of Mixtures, Centrifugation Method, Solvent Extraction (Using a Separating Funnel Method), Sublimation Method, Chromatography Method, Simple Distillation Method, Fractional Distillation Method, Crystallisation Method, Classification of Change: Physical Changes, Classification of Change: Chemical Changes, Pure Substances, Elements, Matter (Substance), Mixture, Solutions, Concentration of a Solution, Suspension Solution, Colloidal Solution, Evaporation Method, Compound, Types of Matter, Types of Mixtures, Centrifugation Method, Solvent Extraction (Using a Separating Funnel Method), Sublimation Method, Chromatography Method, Simple Distillation Method, Fractional Distillation Method, Crystallisation Method, Classification of Change: Physical Changes, Classification of Change: Chemical Changes, Pure Substances, Elements.

Using NCERT Science Class 9 solutions Is Matter around us Pure exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Solutions are essential questions that can be asked in the final exam. Maximum CBSE Science Class 9 students prefer NCERT Textbook Solutions to score more in exams.

Get the free view of Chapter 2, Is Matter around us Pure Science Class 9 additional questions for Mathematics Science Class 9 CBSE, and you can use Shaalaa.com to keep it handy for your exam preparation.

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