Chemistry

chemistry based questions
DIRECTIONS : Questions based on Chemistry.
1. Which one of the following when dissolved in HO gives hissing sound?
  A.  Limestone
  B.  slacked lime
  C.  soda lime
  D.  quick lime
2. Which one of the following is also called Stranger Gas?
  A. Argon
  B. Neon
  C. Xenon
  D. Nitrous oxide

3. What are Rubies and Sapphires chemically known as
  A.  Silicon dioxide
  B.  Aluminium oxide
  C.  Lead tetra oxide
  D.  Boron nitride
4. Which one of the following is used as a mordant in dying and tanning industry?
  A.  Magnesium oxide
  B.  Magnesium carbonate
  C.  Magnesium chloride
  D.  Magnesium sulphate
5. Mixture of which one of the following pairs of gases is the causes of occurance of most of the explosion in mines?
  A.  Hydrogen and oxygen
  B.  oxygen and acetylene
  C.  Methane and air
  D.  Carbon dioxide and methane