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Chemistry Questions and Answers

General Science
81. What is the chemical name for marble?
 
  • A. calcium carbonate
  • B. titanium dioxide
  • C. potassium nitrate
  • D. none of the above
 
 
82. Nucleus of an atom contains
 
  • A. electrons
  • B. electrons and protons
  • C. protons
  • D. protons and neutrons
 
83. In nature borax occurs as
 
  • A. colemanite
  • B. tridymite
  • C. tincal
  • D. borasite
 
84. Which one of the following is a mixture?
 
  • A. sea water
  • B. table salt
  • C. lime
  • D. sugar