9th Class Science Is Matter Around Us Pure Question Bank

done Case Based MCQs - Is Matter Around us Pure Total Questions - 30

• question_answer1)

  Direction: Q. 1 to 5

  Read the following and answer questions from [1] to [5].

  Pure substances are classified as elements or compounds. An element is a substance that contains only one type of atom. Also, an element cannot be broken down or transformed into a new substance even by using some physical or chemical methods.

  A compound is a substance composed of two or more different types of elements, chemically combined in a fixed proportion.

  The constitutents cannot be separated by simple physical methods.

  However, these substances can be broken down into separate elements by chemical methods.

  On the other hand, mixtures are different from pure substances. They are called impure substances. They have different characteristics than elements and compounds.

  They are composed of different elements or compounds mixed together or more than one pure substance that combined together in any composition.

  When, mixture forms, there is only a little or no energy change. Mixtures are further classified into homogeneous and heterogeneous mixture.

  The organic material, wood is
  A)
  an element    done clear
  B)
  a compound done clear
  C)
  a mixture done clear
  D)
  a solution done clear
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• question_answer2)
  Which of the following substances is a compound?
  A)
  Oxygen          done clear
  B)
  Common salt done clear
  C)
  Gold                                         done clear
  D)
  Air done clear
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• question_answer3)
  The substance formed by mixing, crushing and heating iron filings sulphur powder is
  A)
  an element      done clear
  B)
  a compound done clear
  C)
  a mixture        done clear
  D)
  a solution done clear
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• question_answer4)
  Which of the following property does not prove that water is a compound?
  A)
  Water is made up of two different elements done clear
  B)
  Water has fixed boiling point done clear
  C)
  The constituents of water cannot be separated by simple physical methods done clear
  D)
  Distilled water and tap water have same taste and constituents done clear
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• question_answer5)
  Blood is considered as:
  A)
  an element                                 done clear
  B)
  a compound done clear
  C)
  a mixture        done clear
  D)
  a solution done clear
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• question_answer6)

  Direction: Q. 6 to 10
  Read the following and answer questions from [6] to [10].
  Abhinav tested the solubility of four different salts, i.e. potassium nitrate, sodium chloride, potassium chloride and ammonium chloride at different temperature.
  He took four beakers and marked as (I) Potassium nitrate, (II) Sodium chloride, (III) Potassium chloride, (IV) Ammonium chloride and then he dissolved each salt in 100 g of water and placed a thermometer in it. Heated the contents of the beaker and recorded the following observations.
  Substance dissolved	Temperature (in K)
  	283	293	313	333	353
  	Solubility
  I. Potassium nitrate	21	32	62	106	167
  II. Sodium chloride	36	36	36	37	37
  III. Potassium chloride	35	35	40	46	54
  IV. Ammonium chloride	24	37	41	55	66

  Solubility of which substance is highest at 283 K?
  A)
  I                     done clear
  B)
  III done clear
  C)
  IV                                             done clear
  D)
  II done clear
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• question_answer7)
  Which substance show maximum change in its solubility, when the temperature is raised from 313 K to 333 K.
  A)
  I                     done clear
  B)
  II done clear
  C)
  III done clear
  D)
  IV done clear
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• question_answer8)
  In the above question, if the amount of water taken is reduced by 20 per cent, what amount of ammonium chloride would be required to prepare its saturated solution at 353 K?
  A)
  86g                                           done clear
  B)
  53g done clear
  C)
  50g                                           done clear
  D)
  36g done clear
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• question_answer9)
  What is the effect of temperature on the solubility of a salt?
  A)
  It increases with decrease in temperature done clear
  B)
  It decreases with increase in temperature done clear
  C)
  It increases with increase in temperature done clear
  D)
  It does not depend on temperature done clear
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• question_answer10)
  To make lemonade, salts is added in water. The addition of salt in water is a.......
  A)
  suspension                                 done clear
  B)
  colloid done clear
  C)
  heterogeneous solution done clear
  D)
  homogeneous solution done clear
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• question_answer11)

  Direction: Q.11 to 15

  Read the following and answer questions from [11] to [15].

  The scattering of a beam of light by colloidal particles is called Tyndall effect.

  Due to scattering of light, the path of the light becomes visible. The source of light may be explored completely. The size of the scattering particles determines the colour of scattered light. The colloidal particles may be seen moving as points of light moving against a black backdrop.

  Ravi took some amount of substance X and add it into a transparent beaker containing water. He mixed the solution very well and then passed light through this solution by using a torch. The result observed by him is shown below :

  Ravi wants to show this experiment to his younger brother. He kept the solution for 10 minutes and calls his brother and further repeat the experiment, but results are different at this time. The path is not visible.

  What was the reason for change in result?
  A)
  In first case, the path is visible because of the presence of impurities done clear
  B)
  In second case, the particles settle down done clear
  C)
  In second case, the concentration increases done clear
  D)
  In second case, the impurities dissolve in the solution done clear
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• question_answer12)
  What is the nature of solution obtained, when X is added to water?
  A)
  Colloid           done clear
  B)
  True solution done clear
  C)
  Suspension       done clear
  D)
  Data insufficient done clear
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• question_answer13)
  Which of the following show Tyndall effect?
  A)
  Sugar solution done clear
  B)
  Salt solution done clear
  C)
  Starch solution done clear
  D)
  Copper sulphate solution done clear
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• question_answer14)
  Which of the following is an example of colloidal solution?
  A)
  Milk                                          done clear
  B)
  Urea done clear
  C)
  Sugar in water done clear
  D)
  Common salt in water done clear
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• question_answer15)
  When the light passes through the solution in this experiment, then
  A)
  scattering of light is observed done clear
  B)
  path of light becomes visible done clear
  C)
  Tyndall effect is observed done clear
  D)
  AII of the above done clear
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• question_answer16)

  Direction: Q. 16 to 20

  Read the following and answer questions from [16] to [20].

  A mixture is composed of two or more types of matter that can be present in different amounts. Mixtures are either homogeneous or heterogeneous. Homogeneous mixtures are uniform in composition but heterogeneous mixtures are not uniform in composition.

  Different methods of separation are used to get individual components from a mixture.

  Separation makes it possible to study and use the individual components of mixture. Heterogeneous mixtures can be separated into their respective constitutents by simple physical methods like hand picking, sieving filtration that we use in our day-to-day life.

  Sometimes special techniques have to be used for the separation of the components of a mixture for examples, distillation, centrifugation, chromatography etc.

  The separation of a mixture is done to
  A)
  maintain equal composition of substance done clear
  B)
  obtain a pure sample of a substance done clear
  C)
  make it homogeneous mixture done clear
  D)
  AII of the above done clear
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• question_answer17)
  The mixture of ethyl alcohol and water can be separated by
  A)
  distillation        done clear
  B)
  centrifugation done clear
  C)
  filtration          done clear
  D)
  chromatography done clear
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• question_answer18)
  Which of the following technique is used by farmers in village to purify food grains?
  A)
  Sieving          done clear
  B)
  Hand picking done clear
  C)
  Winnowing       done clear
  D)
  AII of these done clear
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• question_answer19)
  The principle of separation based on
  A)
  the difference in sizes of constituents done clear
  B)
  the difference in physical or chemical properties of constituents done clear
  C)
  the different techniques done clear
  D)
  AII of the above done clear
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• question_answer20)
  By filtration, which of the following mixture can be separated?
  A)
  Sugar in water                            done clear
  B)
  Milk in water done clear
  C)
  Sand in water done clear
  D)
  Oil in water done clear
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• question_answer21)

  Direction: Q. 21 to 25

  Read the following and answer questions from [21] to [25].

  Cooking oil and water both are liquid but their chemical properties are different. They differ in odour and inflammability. Oil bums in air whereas water extinguishes fire. It is the chemical property of oil that makes it different from water.

  During a chemical change, one substance reacts with other to undergo a change in chemical compositions. A chemical change as also called a chemical reaction.

  Sometimes both physical and chemical changes take place together.

  Generally, physical changes do not involve the production of energy while chemical changes usually involve the production of energy. Ecosystems have many chemical and physical changes happening all at once and matter is conserved in each and everyone. In any physical or chemical change, matter does not appear or disappear.

  The chemical change brings change in ....... of matter.
  A)
  size                                           done clear
  B)
  temperature done clear
  C)
  phase           done clear
  D)
  proportions done clear
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• question_answer22)
  The interconversion of solid, liquid and gas state is a
  A)
  physical change  done clear
  B)
  chemical change done clear
  C)
  Both [a] and [b]  done clear
  D)
  no change done clear
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• question_answer23)
  Burning is a chemical change and burning of candle is
  A)
  physical change  done clear
  B)
  chemical change done clear
  C)
  Both [a] and [b]  done clear
  D)
  no change done clear
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• question_answer24)
  Colour, hardness, melting points, boiling points, odour, etc., are
  A)
  chemical properties done clear
  B)
  physical properties done clear
  C)
  Both [a] and [b] done clear
  D)
  example of chemical reactions done clear
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• question_answer25)
  Chemical changes are
  A)
  temporary and irreversible done clear
  B)
  permanent and irreversible done clear
  C)
  permanent and reversible done clear
  D)
  temporary and reversible done clear
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• question_answer26)

  Direction: Q. 26 to 30

  Read the following and answer any four questions from [26] to [30].

  Different methods of separation are used to get individual components from a mixture.

  In order to separate components of a mixture, single or a combination of methods are used.

  The method of selection depends upon the nature of the components present in the mixture.

  If liquids in a mixture are miscible and have different boiling points, they can be separated by distillation.

  Distillation involves conversation of a liquid into vapours and then condensing the vapours back into liquid.

  Distillation is used only if the liquids have a difference in boiling point of more than 25 K.

  Which of the following is not separated by distillation?
  A)
  Chloroform and water done clear
  B)
  Milk and water done clear
  C)
  Acetone and ethanol done clear
  D)
  Impurities in sea water done clear
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• question_answer27)
  The distillation is the best technique to separate liquids having different.
  A)
  Solubility                                   done clear
  B)
  Melting points done clear
  C)
  Boiling point      done clear
  D)
  AII of these done clear
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• question_answer28)
  The residue left in the round bottom flask in the distillation process is a liquid having
  A)
  high boiling point done clear
  B)
  low boiling point done clear
  C)
  impurity         done clear
  D)
  high solubility done clear
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• question_answer29)
  The observation made from distillation process is
  A)
  acetone boils first done clear
  B)
  water boils first done clear
  C)
  impurity evaporates done clear
  D)
  water boils at 363 K done clear
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• question_answer30)
  The distillation process involves the
  A)
  decomposition and condensation processes done clear
  B)
  evaporation and condensation processes done clear
  C)
  heating and sublimation processes done clear
  D)
  only evaporation process done clear
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