chemistry based questions
DIRECTIONS : Questions based on Chemistry.
61. What is the chemical name for marble?
  A.  Potassium nitrate
  B.  Calcium carbonate
  C.  Titanium dioxide
  D.  Calcium bicarbonate
62. Which of the following metals is in liquid state at normal room temperature?
  A.  Gallium
  B.  Radon
  C.  Silicon
  D.  Sodium

63. The chemical name of bauxite is
  A.  Aluminium oxide
  B.  Aluminium chloride
  C.  Aluminium sulphite
  D.  Hydrated aluminium oxide
64. Which of the following is the hardest element?
  A.  Copper
  B.  Diamond
  C.  Iron
  D.  Silicon
65. Biogas mainly contains
  A.  Oxygen
  B.  Carbon dioxide
  C.  Methane
  D.  Nitrogen