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Science Do as directed; [Che-1 M]

Is Matter Around Us Pure? · CBSE STD 9 (CBSE - English Medium). 92 questions.

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Question 11 Mark
Whose one of the allotropic forms is a good conductor of electricity. Name the allotrope.
Answer
Allotrope of carbon forms good conductor of electricity. That allotrope is graphite.
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Question 21 Mark
Which type of elements, metals or non-metals, show the property of brittleness?
Answer
Non-metals show brittleness.
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Question 31 Mark
Which technique is used in a washing machine to squeeze out water from wet clothes while drying?
Answer
Centrifugation.
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Question 41 Mark
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person?
Answer
Chromatography.
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Question 51 Mark
Which of the following substances are elements?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Answer
Elements: Mercury, Iron, Diamond, Nitrogen, Graphite, Hydrogen, Oxygen and chlorine.
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Question 71 Mark
Which of the following do not exhibit Tyndall effect?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Answer
Sugar solution, Salt solution, copper sulphate solution and ammonium chloride solution do not show Tyndall effect.
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Question 81 Mark
Which of the following contains less solute at a given temperature and pressure?
Unsaturated solution or Saturated solution.
Answer
Unsaturated solution contains less solute at a given temperature and pressure.
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Question 91 Mark
Which of the following are ‘pure substance’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air.
Answer
Ice, iron, hydrochloric acid, calcium oxide and mercury are the pure substances.
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Question 101 Mark
Which of the following are not compounds?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond.
Answer
Chlorine gas, Aluminium foil, Iodine vapour, Graphite, Sulphur powder, Diamond are not compounds.
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Question 121 Mark
What type of magnet is fitted on a crane to separate scarp iron objects from a heap of waste materials in factories?
Answer
Electromagnet.
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Question 131 Mark
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur?
Answer
Metalloids.
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Question 151 Mark
What is the other name for impure substances? Give two examples of impure substances.
Answer
Mixture is another name for impure substances.
Examples: Milk and sea-water.
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Question 171 Mark
What is the general name of the process by which tea-leaves are separated from prepared tea?
Answer
Filtration.
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Question 181 Mark
What is meant by the concentration of a solution?
Answer
The concentration of a solution is the amount of solute present in given quantity of the solution.
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Question 191 Mark
What is meant by saying that non-metals are brittle?
Answer
This means that metals make a ringing sound when we strike them.
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Question 201 Mark
What is meant by saying that metals are malleable and ductile?
Answer
This means that metals can be drawn into thin sheets and can also be drawn into wires.
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Question 221 Mark
What is meant by caying that metals are sonorous?
Answer
This means that metals make a ringing sound when we strike them.
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Question 231 Mark
What happens when the temperature of a saturated sugar solution is increased?
Answer
When the temperature of a saturated sugar solution is increased, it becomes unsaturated.
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Question 241 Mark
What elements do the following compounds contain?
Sugar, Common salt
Answer
  • Sugar contains carbon, hydrogen and oxygen.
  • Common salt contains sodium and chlorine.
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Question 251 Mark
What do you understand by the statement "the solubility of copper sulphate in water at 20°C is 20.7g"?
Answer
This statement means that 100g of water can dissolve a maximum of 20.7g of copper sulphate at 20°C.
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Question 261 Mark
What differences in the properties of oil and water enable their separation by a separating funnel?
Answer
Difference in the densities of oil and water enable their separation by a separating funnel.
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Question 271 Mark
What difference in the property of two miscible liquids enables their separation by fractional distillation?
Answer
Difference in their boiling point.
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Question 281 Mark
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances?
Answer
The difference in the solubility of salt and sand in water is used to separate them from their mixture.
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Question 291 Mark
What are the three general classes of matter? Give one example of each type.
Answer
Three general classes of matter are elements, compounds and mixtures.
  1. Element: Hydrogen.
  2. Compound: Sodium chloride.
  3. Mixtures: Salt solution.
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Question 301 Mark
What are pure substances? Give two examples of pure substances.
Answer
A pure substance is one which is made up of only one kind of atoms or molecules.
Examples: Oxygen and sugar.
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Question 311 Mark
“The properties of the product are different from those of the constituents”. State whether this statement best describes an element, a compound or a mixture.
Answer
The given statement best describes a compound.
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Question 321 Mark
State whether the following statements are true or false:
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Answer
False.
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Question 341 Mark
State two physical properties on the basis of which metals can be distinguished from non-metals.
Answer
Metals are malleable and ductile whereas non-metals are not.
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Question 351 Mark
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Answer

  • Physical change: Vaporisation (water changes to water vapour or steam)

  • Chemical change: Electrolysis (i.e.water forms hydrogen and oxygen)

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Question 371 Mark
State any two properties for believing that aluminium is a metal.
Answer
Aluminium is malleable, ductile and sonorous, so it is a metal.
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Question 391 Mark

What is the general name of the materials which contain at least two pure substances and show the properties of their constituents?

Answer
Mixtures.
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Question 431 Mark
Out of a colloid, solution and a suspension:
Which one has the smallest particles?
Answer
​​​Solution.
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Question 481 Mark
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine.
Answer
Iodine undergoes sublimation.
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Question 491 Mark
Name the property of any one of the components which can be used for separation the following mixture:
Salt and Camphor.
Answer
Camphor undergoes sublimation.
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