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Chemistry Questions and Answers

General Science
113. The isotope atoms differ in
 
  • A. atomic number
  • B. number of protons
  • C. atomic weight
  • D. number of electrons
 
 
114. The ore of mercury is
 
  • A. galena
  • B. calamine
  • C. cinnabar
  • D. haematite
 
115. The acid present in lemon is
 
  • A. citric acid
  • B. tartaric acid
  • C. malic acid
  • D. lactic acid
 
116. Which one of the following is not a radioactive substance?
 
  • A. uranium
  • B. thorium
  • C. radium
  • D. calcium