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Chemistry Questions and Answers

General Science
149. The ore of manganese is
 
  • A. bauxite
  • B. carninerite
  • C. phrolusite
  • D. pentlandite
 
 
150. Formalin is used as
 
  • A. anesthetic
  • B. preservative
  • C. fuel
  • D. solvent
 
151. What is calomel?
 
  • A. aluminium oxide
  • B. mercuric chloride
  • C. calcium chloride
  • D. mercurous chloride
 
152. Natural rubber is a polymer derived from
 
  • A. butadiene
  • B. ethylene
  • C. isoprene
  • D. propylene