Chemistry

chemistry based questions
DIRECTIONS : Questions based on Chemistry.
26. Which one of the following types of glass can cut off ultraviolet rays?
  A.  soda glass
  B.  pyrex glass
  C.  jena glass
  D.  crookes glass
27. The major ingrediation of leather is
  A.  Carbohydrate
  B.  Collagen
  C.  Polymer
  D.  nuclei acid

28. Which one of the following metals is found in plaster of paris?
  A.  Calcium
  B.  Magnesium
  C.  Pottasium
  D.  Sodium
29. The oxide of Nitrogen used in medicine as anaesthetic is
  A.  Nitrogen dioxide
  B.  Nitric oxide
  C.  Nitrous oxide
  D.  Nitrogen pentoxide
30. Which variety of coal contains the highest percentage of carbon?
  A.  Anthracite
  B.  Peat
  C.  Bituminous
  D.  Lignite