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Chemistry Questions and Answers

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141. What is the most common element in the universe?
 
  • A. hydrogen
  • B. helium
  • C. iron
  • D. oxygen
 
142. The isotope atoms differ in
 
  • A. atomic number
  • B. number of protons
  • C. atomic weight
  • D. number of electrons
 
 
143. The ore of mercury is
 
  • A. galena
  • B. calamine
  • C. cinnabar
  • D. haematite
 
144. The acid present in lemon is
 
  • A. citric acid
  • B. tartaric acid
  • C. malic acid
  • D. lactic acid
 
145. Which one of the following is not a radioactive substance?
 
  • A. uranium
  • B. thorium
  • C. radium
  • D. calcium