CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 2 - MCQExams.com

Air is a _________________.
  • homogeneous mixture
  • heterogeneous mixture
  • compound
  • none of these
Based on the chemical properties, the matter can be classified as ________. 
  • elements
  • compounds
  • mixture
  • All of these
_________ is present in greater quantity in a solution.
  • Solute
  • Solvent
  • Salt
  • Sugar
  • None of these
Which of the following is one of the types of an element?
  • Metal
  • Nonmetal
  • Metalloid
  • All of these
All pure substances have:
  • the same physical state.
  • the same colour.
  • the same composition.
  • a definite set of properties.
While diluting a solution of salt in water, a student by mistake added acetone (boiling point $$56^o\ C$$). What technique can be employed to get back the acetone?
  • Distillation
  • Separation
  • Condensation
  • Evaporation
Which of the following is the seperation technique to seperate mercury and water?
  • Seperating funnel
  • Sublimation
  • Filteration followed by evaporation
  • Seperating funnel followed by evaporation or distillation
The number of phases present in a true solution is:
  • 1
  • 2
  • depends on the number of solutes
  • innumerable
Which of the following are homogeneous in nature?
(i) Ice (ii) Wood (iii) Soil (iv) Air
  • (i) and (iii)
  • (ii) and (iv)
  • (i) and (iv)
  • (iii) and (iv)
What would you observe when an aqueous sugar solution is heated to dryness?
  • Water will vaporize
  • Sugar will be left behind in the container
  • Sugar gets mixed with water and vaporize
  • Sugar gets charged
Which one of the following is not a solution?
  • Brass
  • Lemonade
  • Saltwater
  • Milk
Cloud is an example of foam. This statement is
  • True
  • False
Salt can be recovered from its solution by evaporation. Another technique which can be used for the separation of a salt from its solution is :
  • centrifugation
  • sublimation
  • evaporation
  • crystallization
What would you observe when a mixture of iron filings and sulphur powder is heated strongly?
  • No change at all.
  • The mixture will change its state.
  • No change in the chemical composition of the mixture.
  • A new compound known as ferrous sulphide will be formed.
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
The teacher instructed three students A, B and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide ($$NaOH$$). A dissolved 50g of $$NaOH$$ in 100 ml of water, B dissolved 50g of $$NaOH$$ in 100g of water while C dissolved 50g of $$NaOH$$ in water to make 100 ml of solution. Which one of them has made the desired solution?
  • A
  • B
  • C
  • All of the above
A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be:
  • chloroform
  • water
  • mixture of both
  • none of these
When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk. This indicates that milk is :
  • pure
  • colloidal
  • particle
  • none of the above
Which of the following is seperation technique to seperate kerosene oil, water and salt?
  • Funnel Separation
  • Evaporation
  • Distillation
  • All of these
Which of the following is a seperation technique to seperate potassium chloride and ammonium chloride?
  • Distillation
  • Evaporation
  • Condensation
  • Sublimation
A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called:
  • fractional distillation
  • sedimentation
  • decantation
  • filtration
You are provided with a mixture of petroleum and water. You can separate this mixture by_____.
  • distillation
  • oxidation
  • reduction
  • dehydration
Fog is an example of a colloidal system of :
  • liquid dispersed in gas
  • gas dispersed in gas
  • solid dispersed in gas
  • solid dispersed in liquid
Filtration as a method of separation can be used for mixtures that are:
  • Homogeneous and liquid-in-gas mixtures.
  • Heterogeneous and liquid-in-gas mixtures.
  • Homogeneous and solid-in-liquid mixtures.
  • Heterogeneous and solid-in-liquid mixtures.
Which one of the following statements is incorrect?
  • All elements are homogeneous
  • Compounds made up of a number of elements are homogeneous
  • A mixture is not always heterogeneous
  • Air is a heterogeneous mixture
Two miscible liquids having different boiling points can be separated by:
  • sublimation
  • evaporation
  • fractional distillation
  • loading
Arun has prepared 0.01 % (by mass) solution of sodium chloride in water.
Which of the following correctly represents the composition of the solutions?
  • 1.00 g of NaCl + 100g of water
  • 0.11g of NaCl + 100g of water
  • 0.0l g of NaCl + 99.99g of water
  • 0.10 g of NaCl + 99.90g of water
Of the following substance which is an element, a mixture and a compound? 
Sea water is the example of :
  • element
  • mixture
  • compounds
  • all of these
Method used for separating dyes in ink is called __________.
  • crystallization
  • chromatography
  • distillation
  • filtration
 Which of the following are homogeneous in nature?
 (i) Ice    (II) Wood   (iii) Soil  (iv) Air
  • (i) and (iii)
  • (ii) and (iv)
  • (i) and (iv)
  • (iii) and (iv)
The substance which gives colloidal solution in water is :
  • sugar
  • soap
  • alum
  • plaster of paris
A mixture of sand and iodine can be separated by:
  • distillation
  • magnetic separation
  • sublimation
  • filtration
Benzene and water can be separated by
  • Separating funnel
  • Sublimation
  • Fractional distillatioln
  • Filtration
Distillation method is based on the difference in boiling points of the components of the mixture.
  • True
  • False
A homogeneous mixture of two liquids having a small difference (less than $$25^{o}C$$) in boiling points can be separated by using:
  • centrifugation method
  • fractional distillation method
  • separating funnel method
  • decantation method
During distillation of iodine and methyl alcohol, the non-volatile substance is iodine.
  • True
  • False
Soda water can be separated by lowering the pressure.
  • True
  • False
 The properties of compounds are very ..............from the properties of the elements that form them
  • same
  • different
  • Both A and B
  • we cannot determined
What is $$Y$$?
  • Solute
  • Solvent
  • Salt solution
  • aqueous solution
Soil is ________________ of solids.
  • homogeneous mixture
  • heterogenous mixture
  • true solution
  • none of these
Which among the following is a solid-solid homogenous mixture? 
  • Air
  • Dough
  • Sugar water
  • None of these
Heterogenous mixture is:
  • blood
  • ice in soda
  • salad dressing
  • all of these
Separation of liquid $$N_2$$ from liquid $$O_2$$ is done by fractional ________:
  • distillation
  • crystallization
  • chromatography
  • filtration
State True or False.
The constituents of liquid air containing oxygen and nitrogen can be separated by subjecting to fractional evaporation.
  • True
  • False
A solution is a homogenous mixture of a solute in a solvent.
  • True
  • False
Gun powder is a mixture of sulphur and coke.
  • True
  • False
Milk is an example of :
  • element
  • mixture
  • compound
  • all of these
A homogenous mixture of two gases is :
  • Brass
  • Graphite
  • Air
  • Nitrogen
Which of the following are homogeneous mixtures?
  • Sugar water
  • Vinegar
  • Vodka
  • All of these
Brine or salt is an example of :
  • elements
  • mixture
  • compounds
  • solutions
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