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Chemistry Questions and Answers

General Science
73. Which metal was first used by man?
 
  • A. aluminium
  • B. gold
  • C. iron
  • D. brass
 
 
74. Smelting process of extraction of iron contains
 
  • A. lime
  • B. coke
  • C. coke and limestone
  • D. coke and aluminium
 
75. pH of blood is
 
  • A. 4
  • B. 6.4
  • C. 7.4
  • D. 8
 
76. First atomic model was proposed by
 
  • A. D.I. Mendeleef
  • B. De Broglie
  • C. E.Rutherford
  • D. John Dalton