Railways General Science & Technology Occurence and Extraction of Metals Sample Paper

done Occurence and Extraction of Metals Sample Test Paper-18 Total Questions - 20    [Download]

• question_answer1)
  Which of the following metals is present in the anode mud during the electrolytic refining of copper?
  A)
   Sodium
  done clear
  B)
   Aluminium
  done clear
  C)
   Selenium         
  done clear
  D)
   Both [b] and [c]
  done clear
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• question_answer2)
  The second most abundant element in the earth's crust is
  A)
   Oxygen
  done clear
  B)
   silicon
  done clear
  C)
   Aluminium       
  done clear
  D)
   icon
  done clear
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• question_answer3)
  During smelting, an additional substance is added which combines with impurities to form a fusible product. It is known as
  A)
   Slag                
  done clear
  B)
   mud
  done clear
  C)
   Gangue
  done clear
  D)
   flux
  done clear
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• question_answer4)

  Metals are refined by using different methods. Which of the following metals refined by electrolytic refining?

  (i) Ag

  (ii) Cu

  (iii) Na

  (iv) Al

  A)
   (i) and (ii)
  done clear
  B)
   (ii) and (iii)
  done clear
  C)
   (i) and (iii)        
  done clear
  D)
   (iii) and (iv)
  done clear
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• question_answer5)
  The method used for reduction of mercuric oxide to mercury is
  A)
   Heating
  done clear
  B)
   Chemical reduction
  done clear
  C)
   Tinning
  done clear
  D)
   Galvanization
  done clear
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• question_answer6)
  Which of the following oxides, on reduction with carbon gives metal?
  A)
   \[C{{r}_{2}}{{O}_{3}}\]        
  done clear
  B)
  \[ZnO\]
  done clear
  C)
   \[Mn{{O}_{2}}\]         
  done clear
  D)
   All of these
  done clear
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• question_answer7)
  Identify an ore containing sulphur in it
  A)
   Siderite
  done clear
  B)
   Fluorspar
  done clear
  C)
   Iron pyrites       
  done clear
  D)
   Calamine
  done clear
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• question_answer8)
  Aluminium is extracted from bauxite
  A)
   By reduction with carbon
  done clear
  B)
   By reduction with Mg
  done clear
  C)
   By reduction with CO
  done clear
  D)
   By electrolysis in molten cryolite
  done clear
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• question_answer9)
  Which of the following is always found in a free state in nature?
  A)
   Gold               
  done clear
  B)
   silver
  done clear
  C)
   Sodium
  done clear
  D)
   copper
  done clear
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• question_answer10)
  The metal that is usually extracted from sea water is
  A)
   Ca                  
  done clear
  B)
   Na
  done clear
  C)
   K                    
  done clear
  D)
   Mg
  done clear
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• question_answer11)
  The method of concentrating the ore which makes use of difference in density between ore and impurities is called
  A)
   Liquation         
  done clear
  B)
   Leaching
  done clear
  C)
   Levigation        
  done clear
  D)
   Magnetic separation
  done clear
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• question_answer12)
  The most important ore of aluminium is
  A)
   Bauxite
  done clear
  B)
   magnetite
  done clear
  C)
   Haematite        
  done clear
  D)
   monazite
  done clear
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• question_answer13)
  The sulphide ores of metals are concentrated by
  A)
   Cupellation      
  done clear
  B)
   electrolysis
  done clear
  C)
   Froth flotation
  done clear
  D)
   calcination
  done clear
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• question_answer14)
  Until the nineteenth century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The investor was
  A)
   Goldschmidt     
  done clear
  B)
   Mond
  done clear
  C)
   Charles-Martin Hall
  done clear
  D)
   Parkes
  done clear
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• question_answer15)
  A metal obtained directly by roasting of its sulphide ore is
  A)
   Hg                  
  done clear
  B)
   Cu
  done clear
  C)
   Zn                   
  done clear
  D)
   Pb
  done clear
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• question_answer16)
  Calcination is
  A)
   Heating the ore strongly in the absence of any blast of air
  done clear
  B)
   Heating the ore with limestone
  done clear
  C)
   Heating the ore with calcium
  done clear
  D)
   Heating the ore with carbon
  done clear
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• question_answer17)
  Which of the following can be purified by the electrolytic method?
  A)
   Sodium (Na)
  done clear
  B)
   selenium (Se)
  done clear
  C)
   Boron  
  done clear
  D)
   chlorine \[(C{{I}_{2}})\]
  done clear
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• question_answer18)
  Which of the following metals can be extracted from the ore called cassiterite?
  A)
   Zinc (Zn)          
  done clear
  B)
   mercury (Hg)
  done clear
  C)
   Calcium (Ca)
  done clear
  D)
   tin (Sn)
  done clear
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• question_answer19)
  Malachite, azurite, and chalcopyrite are ores of
  A)
   Nickel  
  done clear
  B)
   chromium
  done clear
  C)
   Calcium           
  done clear
  D)
   copper
  done clear
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• question_answer20)
  Zone refining is used for the purification of
  A)
   Au                  
  done clear
  B)
   Ge
  done clear
  C)
   Ag                  
  done clear
  D)
   Cu
  done clear
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