chemistry based questions
DIRECTIONS : Questions based on Chemistry.
21. What is the main constituent of coal gas?
  A.  Oxygen
  B.  Water
  C.  Nitrogen
  D.  Methane
22. For Which one of the following is the density maximum ?
  A. Chloroform
  B. Water
  C. Benzene
  D. Ice

23. The chemicals used as a fixer in phosphorous is
  A.  borax
  B.  sodium thiosulpahte
  C.  sodium sulphate
  D.  ammonium persulphate
24. Which one of the following does not contain silver?
  A.  horn silver
  B.  german silver
  C.  ruby silver
  D.  Lunar caustic
25. Which one among the following is called philosophers wool?
  A.  zinc bromide
  B.  zinc nitrate
  C.  zinc oxide
  D.  zinc chloride