CBSE Class 9 Science, Is Matter Around Us Pure: Important Topics and Questions

Get the CBSE Class 9th Science chapter, Is Matter Around Us Pure: Important topics & questions to prepare for CBSE Class 9 Science Examination, 2017-2018. This will provide you with a very clear idea about what type of questions are being framed for the exam and from which topics. The pattern in which the question paper is set is quite different from the style in which the course structure is actually defined. Consider the below mentioned terms/questions at the time of preparation.

Check out the important topics to pick from chapter- Is Matter around Us Pure:

Study this table very carefully and try to remember it. Nearly every year questions have been asked in this table.

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Type of Mixture

Heterogeneous Mixture

Homogenous Mixture

1. Gas in gas


Air

2. Gas in liquid


Aerated water

3. Gas in solid


Hydrogen in palladium

4. Liquid in liquid

Water + Oil, Milk

Ethyl alcohol + Water

5. Liquid in solid


Mercury in amalgamated Zinc

6. Solid in liquid

Chalk in water, Dust in water

Sugar in water

7. Solid in solid

Sand + Iron Fillings, Sand + ammonium chloride

Alloys e.g. brass

          Solid solutions are called _______ and gaseous solutions are called _______

Read the following points carefully:

(i) A solution of sugar in water is a solid in liquid solution. In this solution, sugar is the solute and water is the solvent.

(ii) A solution of iodine in alcohol known as ‘tincture of iodine’ has iodine (solid) as the solute and alcohol (liquid) as the solvent.

(iii) Aerated drinks like soda water etc., are gases in liquid solutions. These contain carbon dioxide (gas) as solute and water (liquid) as solvent.

(iv) Air is a mixture of gas in gas. Air is a homogeneous mixture of a number of gases. Its two main constituents are: oxygen (21%) and nitrogen (78%). The other gases are present in very less quantity.

(a) Sugar in water

(b) Urea in water

(c) Ammonium chloride in water

(d) Ethyl alcohol in water

(e) Carbon Di-Oxide in water (soda water)

              (i) Butter from curd

              (ii) Salt from sea-water

              (iii) Camphor from salt

Revise the important topics for the chapter Is Matter around Us Pure and then opt for the Important Questions:

Q.  Name the elements are in liquid state at room temperature.

Q. Separate the following as mixture or compound.

(i) Blood

(ii) Common salt

(iii) Sugar

(iv) Brass

Q. Solutions do not exhibit Tyndall effect. Reason

Q. What are the characteristics of mixture?

Q. When we open the cap of an any carbonated beverage (like Pepsi drink), why does excess   of bubbles come out?

Q. What are suspensions? Explain with an example.

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