VSAQ for Ch 2 Is Matter around us Pure Class 9 Science NCERT
Important Questions1
What is a pure substance ?
Answer
A substance which is made up of only a single type of particle is called a pure substance.
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2
Name the two types of mixtures.
Answer
Homogeneous mixtures and heterogeneous mixtures.
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3
What is a substance ?
Answer
A substance is a kind of matter that cannot be separated into other kinds of matter by any physical process.
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4
What are mixtures ?
Answer
Mixtures are constituted by more than one kind of pure form of matter, i.e. pure substances.
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5
What is a heterogeneous mixture ?
Answer
A mixture that does not have uniform composition throughout its mass is called a heterogeneous mixture.
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6
What is a homogeneous mixture ?
Answer
A mixture that has uniform composition throughout its mass is called a homogeneous mixture.
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7
Give an example of a liquid in liquid type solution.
Answer
Vinegar (acetic acid + water)
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8
Define a solution.
Answer
A homogeneous mixture of two or more substances is called a solution.
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9
Which of the following is/are pure substance(s)?
Ink, paper, water, milk, butter, ghee, sugar, blood.
Answer
Water and sugar.
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10
What are the constituents of milk?
Answer
Milk is a mixture of water, fat and proteins.
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11
Give an example of a gas in liquid solution.
Answer
Aerated drinks like soda water.
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12
Give an example of a solid in liquid solution.
Answer
A solution of sugar and water.
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13
Give an example of a solid solution.
Answer
Brass (an alloy having 70% copper and 30% zinc).
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14
What is solubility ?
Answer
Solubility of a substance (solute) is the mass of the substance in grams that dissolves in 100 g of a solvent to form a saturated solution.
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15
Define concentration of a solution.
Answer
It indicates the exact amount of solute dissolved in an exact amount of solvent or solution.
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16
What is filtration?
Answer
When the insoluble component is separated by filtering the solution through a medium or membrane it is called filtration.
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17
How can we obtain different gases from air?
Answer
By the process of fractional distillation.
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18
How can we separate a mixture of two immiscible liquids?
Answer
By using a separating funnel.
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19
How can we separate cream from milk?
Answer
By centrifugation method.
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20
How can we separate a mixture of two miscible liquids?
Answer
By distillation.
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21
Give an application of crystallization.
Answer
Purification of salt that we get from sea water.
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22
How can we obtain pure copper sulphate from an impure sample?
Answer
By crystallization.
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23
For the separation of what kind of solutes is the process of chromatography used?
Answer
Chromatography is used for the separation of those solutes that dissolve in the same solvent.
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