NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure help students understand the concepts of pure substances and mixtures, along with methods of separating components. This chapter explains the difference between elements, compounds, and mixtures, and introduces techniques like filtration, distillation, and chromatography.

Prepared according to the latest CBSE Class 9 Science syllabus, these solutions provide clear and structured answers to all textbook questions. Practicing these solutions helps students strengthen their concepts and perform better in exams.

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure

Is Matter Around Us Pure
Medium
Q.
Which separation techniques will you apply for the separation of the following?

(a) Sodium chloride from its solution in water.

(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.

(c) Small pieces of metal in the engine oil of a car.

(d) Different pigments from an extract of flower petals.(e) Butter from curd.

(f) Oil from water.

(g) Tea leaves from tea.

(h) Iron pins from sand.

(i) Wheat grains from husk.

(j) Fine mud particles suspended in water.
Is Matter Around Us Pure
Easy
Q.
Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
Is Matter Around Us Pure
Medium
Q.
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)



(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. Which salt has the highest solubility at this temperature?

(d) What is the effect of change of temperature on the Solubility of a salt?
Is Matter Around Us Pure
Medium
Q.
Explain the following giving examples.
(a) saturated solution
(b) pure substance
(c) colloid
(d) suspension
Is Matter Around Us Pure
Medium
Q.
Classify each of the following as a homogeneous or heterogeneous mixture.
soda water, wood, air, soil, vinegar, filtered tea.
Is Matter Around Us Pure
Easy
Q.
How would you confirm that a colourless liquid given to you is pure water?
Is Matter Around Us Pure
Easy
Q.
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
Is Matter Around Us Pure
Easy
Q.
Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air
(d) Coal
(e) Soda water
Is Matter Around Us Pure
Medium
Q.
Which of the following will show “Tyndall effect”?
(a) Salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution.
Is Matter Around Us Pure
Medium
Q.
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
Is Matter Around Us Pure
Medium
Q.
Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure

Q1. What is meant by a pure substance?

Ans: A pure substance is a material that consists of only one type of particles and has a fixed composition, such as elements and compounds.

Q2. List the points of difference between homogeneous and heterogeneous mixtures.

Ans:

  • Homogeneous mixture: Uniform composition, e.g., salt solution
  • Heterogeneous mixture: Non-uniform composition, e.g., sand and water

Q3. Differentiate between elements and compounds.

Ans:

  • Element: Made of one type of atom, cannot be broken down further
  • Compound: Made of two or more elements chemically combined

Q4. What are the types of mixtures?

Ans: Mixtures are of two types:

  • Homogeneous mixtures
  • Heterogeneous mixtures

Q5. Name the techniques used for separation of mixtures.

Ans:
Filtration, evaporation, distillation, chromatography, centrifugation, and sublimation.

Q6. How can you separate cream from milk?

Ans: By using centrifugation, cream can be separated from milk.

Q7. What is chromatography?

Ans: Chromatography is a method used to separate components of a mixture based on their movement through a medium.

Q8. What is a solution?

Ans: A solution is a homogeneous mixture of two or more substances.

FAQs – Class 9 Science Chapter 2 Is Matter Around Us Pure

Q1. What is a mixture?
A mixture is a substance made of two or more components physically combined.

Q2. What is the difference between solution and suspension?
Solution is clear and stable, while suspension is cloudy and unstable.

Q3. What is colloid?
A colloid is a mixture where particles are intermediate in size and do not settle down.

Q4. What are pure substances?
Pure substances include elements and compounds with fixed composition.

Q5. Why is this chapter important for exams?
This chapter includes conceptual and application-based questions related to separation techniques and types of matter.