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Worksheet for Class 9 Science Chapter 2 Is Matter Around Us Pure
Class 9 Science students should refer to the following printable worksheet in Pdf for Chapter 2 Is Matter Around Us Pure in Class 9. This test paper with questions and answers for Class 9 will be very useful for exams and help you to score good marks
Class 9 Science Worksheet for Chapter 2 Is Matter Around Us Pure
CBSE Class 9 Science Worksheet - Is Matter Around Us Pure
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Question. Brass is a
(c) Homogeneous mixture
(d) Heterogeneous mixture
Answer : C
Question. Nanometer is an
(a) lnstrumen~ used for measuring micro-distance
(b) Instrument used for measuring macro-distance
(c) Unit for measuring micro-distance
(d) Unit for measuring macro-distance.
Answer : C
Question. Air shows the property of
(c) Both (a) and (b)
(d) None of these.
Answer : C
Question. Anemometer measures
(a) Amount of haemoglobin in blood
(b) Pollination of plant by the wind
(c) Wind resistance
(d) Wind speed.
Answer : D
Question. In sugar solution,
(a) Sugar is solute, water is solvent
(b) Sugar is solvent, water is solute
(c) Both are solutes
(d) Both are solvents.
Answer : A
Question. Mixture can be
(c) Both (a) and (b)
(d) pure substance
Answer : C
Question. Barometer measures
(c) Wind velocity
(b) Atmospheric pressure
(d) Gaseous pressure.
Answer : B
Question. Brass is a solution of molten copper in
(a) solid zinc
(b) molten zinc
(c) gaseous zinc
(d) molten tin
Answer : B
Question. The components of water can be separated by
(a) Physical methods
(b) Chemical methods
(d) They can't be separated
Answer : B
Question. If we burn graphite,
(a) residue will be left
(c) it will not burn
(b) no residue will be left
(d) it will change into diamond.
Answer : B
Short Answer Type Question :
Question. How are sol. solution and suspension different from each other?
Answer : Sol is a heterogeneous mixture. In this mixture, the solute particles are so small that they cannot be seen with the naked eye. Also, they seem to be spread uni.formly throughout the mixture. The Tyndall effect is observed in this mixture. For example: milk of magnesia, mud Solution is a homogeneous mixtu.re. In this mixture, the solute particles dissolve and spread uniformly throughout the mixture. The Tyndall effect is not observed in this mixture. For example: salt in water, sugar in water, iodine in alcohol, a.!loy Suspensions are heterogeneous mixtures. In this mixture, the solute particles are visible to the naked eye, and remain suspended throughout the bulk of the medium. The Tyndall effect is observed in this mixture.
For example: chalk powder and water, wheat flour and water
Question. What type of mixtures is separated by the technique of crystallization?
Answer : By the technique of crystallization, pure solids are separated from impurities. For example, salt obtained from the sea is separated from impurities; crystals of alum (Phitkan) are separated from impure samples.
Question. Differentiate between homogeneous and heterogeneous mixtures with examples.
Answer : A homogeneous mixture is a mixtufe having a uniform composition throughout the mixture. For example, mixtures of salt in water, sugar in water, copper sulphate in water, iodine in alcohol, alloy, and air have uniform compositions throughout the mixtures.
On the other hand, a heterogeneous mixture is a mixture having a nonuniform composition throughout the mixture. For example, composition of mixtures of sodium chloride and iron fillings, salt and sulphur, oil and water, chalk powder in water, wheat flour in water, milk and water are not uniform throughout the mixtures.
Question. 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?
Answer : A mixture of kerosene and petrol which are miscible with each other can be separated by distillation.
• Take a mixture in a distillation flask.
• Fit it with a thermometer.
• Arrange the apparatus as shown in the figure.
• Heat the mixture slowly.
• Petrol vaporises first as it has lower boiling point.
It condenses in the condenser and is collected from the condenser outlet.
• Kerosene is left behind in the distillation flask.
Question. To make a saturated solution, 36 g of sodium chloride is dissolved in 1 00 g of water at 293 K. Find its concentration at this temperature.
Answer : Mass of solute (sodium chloride) = 36 g (Given)
Mass of solvent (water) = 100 g (Given)
Then, mass of s.olution = Mass of solute + Mass of solvent
= (36 + 1 00) g
= 136 g
Therefore, concentration (mass by mass percentage) of the solution
= Mass of solute/Mass of solvent x 100%
= 36/136 x 100%
(Q.1) <#> Name the process which can be used to recover sugar from an aqueous sugar solution .
(Q.2) <#>What happens when a saturated solution is heated ?
(Q.3) <#> Name the process you would use to separate a mixture of water and alcohol.
(Q.4) <#> Give an example of an aqueous solution in which gas is dissolved.
(Q.5) <#>What is the cause of Tyndall effect as shown by colloid ?
(Q.6) <#> Give two examples of colloidal solution .
(Q.7) <#> Name the technique to separate -
(a) Salt from sea water
(b) Butter from curd
(Q.8) <#>When a paper is burnt it is considered a chemical change because
(A) The change is permanent. (B) There is no change in mass.
(C) The chemical composition changes. (D) Both (1) and (3)
(Q.9) <#> An aqueous solution at room temperature was heated and some more solute was added to it.
It was observed that after sometime solution could not dissolve any more of the solute. The solution
now formed is called
(A) Saturated solution. (B) Super saturated solution.
(C) Unsaturated solution. (D) Homogeneous solution.
(Q.10) <#> A mixture of iron filings and sulphur powder can be separated using
(A) A magnet (B) Handpicking
(C) Carbon disulphide solution (D) Both (1) and (3)
(Q.11) <#> A mixture of chalk powder and water can be separated using the technique of filtration
(A) Chalk powder remains suspended in water.
(B) They form a miscible solution.
(C) The mixture can easily pass through filter paper
(D)Water acts as a good solvent.
(Q.12) <#> The necessary condition for separation of the components of a mixture regarding the boiling
points of the components of a mixture of two or more miscible liquids is
(A) Their boiling points should be same
(B) Their boiling points should be less than 373 K.
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CBSE Class 9 Science Chapter 2 Is Matter Around Us Pure Worksheet
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Worksheet for Science CBSE Class 9 Chapter 2 Is Matter Around Us Pure
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Chapter 2 Is Matter Around Us Pure worksheet Science CBSE Class 9
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Chapter 2 Is Matter Around Us Pure CBSE Class 9 Science Worksheet
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Worksheet for CBSE Science Class 9 Chapter 2 Is Matter Around Us Pure
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