8th Class Science Materials : Metals and Non-metals Question Bank

done Materials : Metals and Non-metals Total Questions - 35

• question_answer1)
  How many electrons are generally present in metals in their valence shell?
  A)
   1, 2 or 3                               done clear
  B)
                          7, 8 or 9                               done clear
  C)
                          10, 11 or 12        done clear
  D)
                          20, 30 or 40        done clear
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• question_answer2)
  How many electrons are present in non- metals in their outermost shell?
  A)
   1, 2 or 3  done clear
  B)
                                                          8, 9 or 10                             done clear
  C)
                          10, 20 or 30        done clear
  D)
                          4, 5, 6 or 7           done clear
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• question_answer3)
  To which category do antimony and arsenic belong?
  A)
   Metals                                 done clear
  B)
                          Metalloids                          done clear
  C)
                          Non-metals       done clear
  D)
                          Minerals                             done clear
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• question_answer4)
  Identify the metal that replaces magnesium from its salt.
  A)
   Ca                                          done clear
  B)
                         \[Al\]                     done clear
  C)
                          Zn                                          done clear
  D)
                          Fe                          done clear
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• question_answer5)
  Aluminium foil is used for wrapping food. On which property is it used?
  A)
   Density                                done clear
  B)
                          Malleability                        done clear
  C)
                          Ductility                               done clear
  D)
                          Strength             done clear
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• question_answer6)
  Identify the non-metal which exhibits yellow colour.
  A)
   Silicon                                  done clear
  B)
                          Phosphorus                       done clear
  C)
                          sulphur                                done clear
  D)
                          Carbon done clear
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• question_answer7)
  Which of the following are the properties of non-metals?

  (i) They have low densities

  (ii) They have low melting points

  (iii) They are poor conductors of electricity

                 
  A)
                   Only (i) and (ii)                 done clear
  B)
                                                                          Only (ii) and (iii)                 done clear
  C)
                                          Only (i) and (iii)                 done clear
  D)
                                          (i), (ii) and (iii)                 done clear
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• question_answer8)
  Which of the following non-metals exists in liquid state at room temperature?
  A)
   Chlorine                              done clear
  B)
                          Nitrogen                             done clear
  C)
                          Bromine                              done clear
  D)
                          Hydrogen                           done clear
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• question_answer9)
  Identify the metal that does NOT react with \[HCl\]
  A)
   Ag                                          done clear
  B)
                          Mg        done clear
  C)
                          M                                           done clear
  D)
                          Fe                          done clear
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• question_answer10)
  Which metal reacts vigorously with\[HCl\]to produce salt and hydrogen?
  A)
   Na                                         done clear
  B)
                          Zn          done clear
  C)
                          Sn                                          done clear
  D)
                          Pb done clear
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• question_answer11)
  When non-metals combine with oxygen, what do they produce?
  A)
   Acidic oxides done clear
  B)
                          Basic oxides done clear
  C)
                          Amphoteric oxides done clear
  D)
                          Salts done clear
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• question_answer12)
  Identify the oxide of a non-metal which is neutral.
  A)
  \[S{{O}_{2}}\]                                    done clear
  B)
                         \[N{{O}_{2}}\]                   done clear
  C)
                         \[{{P}_{2}}{{O}_{3}}\]                     done clear
  D)
                         \[CO\] done clear
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• question_answer13)
  Phosphorus combines with oxygen to form oxides. How many types of oxides are formed by it?
  A)
   One                                      done clear
  B)
                          Two                      done clear
  C)
                          Three done clear
  D)
                                                          Four done clear
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• question_answer14)
  Which of the following dissolves in water to form sulphuric acid?
  A)
   Sulphur dioxide done clear
  B)
                          Sulphur done clear
  C)
                          Sulphur trioxide done clear
  D)
                          Copper sulphate done clear
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• question_answer15)
  Which of the following compounds is used to make photographic films?                
  A)
                   Sodium chloride                 done clear
  B)
                                          Silver bromide                 done clear
  C)
                          Potassium iodide done clear
  D)
                          Copper chloride done clear
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• question_answer16)
  Which material is used for making crucibles?
  A)
   Sulphur                               done clear
  B)
                          Silicon                  done clear
  C)
                          Graphite                             done clear
  D)
                          Phosphorus                       done clear
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• question_answer17)
  Which non-metal is used in the treatment of rubber during the process of vulcani-sation?
  A)
   Sulphur                               done clear
  B)
                          Phosphorus                       done clear
  C)
                          arbon                                   done clear
  D)
                          Chlorine                              done clear
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• question_answer18)
  Which of the following is called a noble metal?
  A)
   Mercury                              done clear
  B)
                          Gold                     done clear
  C)
                          Lithium                                done clear
  D)
                          Caesium done clear
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• question_answer19)
  Identify the metal which is soft.
  A)
   Na                                         done clear
  B)
                          Pb                          done clear
  C)
                          AZ                                          done clear
  D)
                          Cu done clear
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• question_answer20)
  Why is tungsten used as a filament in electric bulbs?
  A)
   It is sonorous. done clear
  B)
                          It is metallic. done clear
  C)
                          It has a high melting point. done clear
  D)
                          It has high density. done clear
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• question_answer21)
  Which of the following is NOT a heavy metal?
  A)
   Cd                                          done clear
  B)
                          Hg                          done clear
  C)
                          Pb                                          done clear
  D)
                          K done clear
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• question_answer22)
  Which of the following substances will prevent corrosion of metals?
  A)
   Nitrogen                             done clear
  B)
                          Hydrogen done clear
  C)
                          Oxygen                               done clear
  D)
                          Carbon done clear
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• question_answer23)
  Which of the following metals in their molten state cause galvanization of an iron article?
  A)
   Zinc         done clear
  B)
                                                          Copper                                done clear
  C)
                          Carbon                                done clear
  D)
                          Gold done clear
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• question_answer24)
  Arrange the given metals in the descending order of their reactivity.
  A)
   Aluminium, copper, potassium done clear
  B)
                          Sodium, iron, copper done clear
  C)
                          Silver, zinc, calcium done clear
  D)
                          Magnesium, copper, sodium done clear
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• question_answer25)
  When a little aluminium powder is added to dilute sulphuric acid, the produces(s) formed in the reaction is
  A)
   sulphur dioxide. done clear
  B)
                          aluminium sulphate. done clear
  C)
                          hydrogen. done clear
  D)
                          Both (B) and (C) done clear
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• question_answer26)
  Which of the following statements is true of the given chemical reactions?

  \[ZnO+C\to Zn+CO\]

  \[2F{{e}_{3}}{{O}_{3}}+3C\to 6Fe+3C{{O}_{2}}\]

  A)
   Carbon is reduced. done clear
  B)
                          Carbon is oxidized. done clear
  C)
                          Metal oxide is reduced to metal. done clear
  D)
                          Metal oxide is oxidized. done clear
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• question_answer27)
  Why is gold mixed with copper?
  A)
   To make gold soft done clear
  B)
                          To make gold hard done clear
  C)
                          To make gold more yellowish done clear
  D)
                          To give gold a lustre done clear
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• question_answer28)
  Which of the following statements is correct?
  A)
   All metals are ductile. done clear
  B)
                          All non-metals are ductile. done clear
  C)
                          Generally, metals are ductile. done clear
  D)
                          Some non-metals are ductile. done clear
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• question_answer29)
  Study the reaction given below.

  \[X+YS{{O}_{4}}\to Y+XS{{O}_{4}}\]

  What are X and T?
  A)
  \[Al,Mg\]      done clear
  B)
                                                         \[Zn,Cu\]                             done clear
  C)
                         \[Ag,K\]                               done clear
  D)
                          \[H,Al\] done clear
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• question_answer30)
  Which of the following is NOT a general property of metals?
  A)
                   Ductility done clear
  B)
                                          Malleability                 done clear
  C)
                                          Bad conductor of electricity                 done clear
  D)
                                          Sonorous nature done clear
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• question_answer31)
  Which of the following is a chemical displacement reaction?
  A)
  \[2Al+F{{e}_{2}}{{O}_{3}}\xrightarrow[{}]{heat}A{{l}_{2}}{{O}_{3}}+2Fe+Heat\] done clear
  B)
                          \[2Na+C{{l}_{2}}\to 2\,NaCl\] done clear
  C)
                          \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\xrightarrow{{}}2{{H}_{3}}P{{O}_{4}}\] done clear
  D)
                          \[2\,PbS+3{{O}_{2}}\xrightarrow[{}]{heat}PbO+3S{{O}_{2}}\] done clear
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• question_answer32)
  Which of the following statements is NOT true of sodium and potassium?
  A)
   Both are metals. done clear
  B)
                          Both are hard. done clear
  C)
                          Both are solids at room temperature. done clear
  D)
                          Both react with oxygen to form oxides. done clear
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• question_answer33)
  Identify the true statement from the following.
  A)
   Metals have fixed melting points whereas non-metals do not.  done clear
  B)
                          All metals are malleable. done clear
  C)
                          The hardest substance known is a non-metal. done clear
  D)
                          Tungsten is a bad conductor of heat and electricity. done clear
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• question_answer34)
  Which of the following metals does NOT produce hydrogen gas when added to acid?
  A)
   Potassium                          done clear
  B)
         Gold                     done clear
  C)
         Zinc                                       done clear
  D)
         Magnesium       done clear
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• question_answer35)
  Metal 'X? reacts very slowly with water but reacts vigorously with steam. Identify metal X
  A)
   Magnesium                       done clear
  B)
         Silver                    done clear
  C)
         Copper                                done clear
  D)
         Potassium done clear
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