NCERT Solutions for Class 9 Chapter 2 Science Question Answer

Chapter 2 of Class 9 Science, “Is Matter Around Us Pure?”, explains that matter is made up of substances that can be pure or mixed with others.

It talks about different types of mixtures like solutions, colloids, and suspensions. The chapter also teaches how we can separate the parts of a mixture using methods like filtration and distillation.

NCERT Solutions for Class 9 Science Chapter 2

NCERT Class 9 Science Chapter 2 focuses on the structure of matter, covering topics like atoms, molecules, and the laws of chemical combination.

NCERT Solutions for Class 9 Science Chapter 1  

NCERT Solutions Class 9 Chapter 2 Science Question Answer

NCERT Solutions Class 9 Chapter 2 Science Question Answer provides detailed and accurate answers to all the questions in Chapter 2, “Is Matter Around Us Pure?”. The solutions explain different types of mixtures such as solutions, colloids, and suspensions. These answers help students prepare effectively for exams with step-by-step explanations.

Solution : Substance can be defined as that kind of matter where constituent particles cannot be separated from each other by any physical process since they are all similar in chemical properties.

CBSE Class 9 Science Syllabus

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CBSE Class 9 Chemistry Notes

Solution : We can separate a mixture containing kerosene and petrol by distillation technique since difference in their boiling points is more than. So through distillation we can get them separated.

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Solution : From impure samples of solids, pure solid crystals can be obtained by the method of crystallization for eg to obtain pure sugar from impure sample of the same.

Solution : Take more amount of solvent (water) in a pan and after heating it add little amount of solute (sugar) to the solvent. Solute will dissolve completely in the solvent forming true solution, then add tea leaves that are insoluble along with another soluble liquid milk. After boiling allow filtration with a sieve so the filtrate you obtain is tea while the residue has tea leaves that are thrown away.

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CBSE Class 9 Biology Notes

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Solution : A mixture of kerosene and petrol which are miscible with each other can be separated by distillation. Method

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(a) saturated Solution :- It is a solution in which no more solute particles can be dissolved at a particular temperature.

(b) pure substance :- Such substance that has a uniform composition i.e. has particles with identical properties is called pure substance eg sugar, salt, water, nitrogen etc.

(c) Colloid :- A colloid is a heterogeneous mixture. The size of the solutes in this mixture is so small that they cannot be seen individually with naked eyes, and seems to be distributed uniformly throughout the mixture. The solute particles do not settle down when the mixture is left undisturbed. This means that colloids are quite stable. Colloids cannot be separated by the process of filtration. They can be separated by centrifugation. Colloids show the Tyndall effect. For example, milk, butter, foam, fog, smoke, clouds.

(d) Suspension :- Suspensions are heterogeneous mixtures. The solute particles in this mixture remain suspended throughout the bulk of the medium. The particles can be seen with naked eyes. Suspension shows the Tyndall effect. The solute particles settle down when the mixture is left undisturbed. This means that suspensions are unstable. Suspensions can be separated by the method of filtration. For example, mixtures of chalk powder and water, wheat flour and water.

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Solution : If we allow the given liquid to evaporate by heating it as in a clean china dish so:

Solution : Pure substances are: ice, iron, hydrochloric acid, calcium oxide, mercury.

Solution : Sea water, air and soda water are solutions.

Solution : Milk and starch solution have larger particles since they are not true solutions so they will show tyndall effect.

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