Home

Rust is

A. A mixture of FeO and Fe(OH)2

B. A mixture of Fe2O3 and Fe(OH)2

C. A mixture of Fe2O3, 3H2O and FeO

D. FeO only

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. What is the unit for measuring the pitch or frequency of sound ?
  2. Quartz crystals normally used in quartz clocks etc. is chemically
  3. Cell membrane is
  4. Brass gets discoloured in air due to the presence of which gas in air
  5. Glass is made from the mixture of
  6. The solar eclipse occurs when
  7. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  8. The smallest functional and structural unit of kidney is called as
  9. Old-written material, which cannot be read easily can be read by
  10. The oxide of Nitrogen used in medicine as anaesthetic is
  11. The element present in the largest amount in rocks and minerals is
  12. The fastest-running terrestrial animal is
  13. The metallic constituents of hard water are
  14. According to Daltons atomic theory the smallest particle which can exist independently is
  15. The hardest substance available on earth is
  16. The metal that is present in Photo Films is
  17. The recent atomic weight scale is based on
  18. Which of the following is the lightest metal ?
  19. Which of the following characters is not shown by hydrogen
  20. The intencity of Earthquakes is measured on
  21. The metal used in storage batteries
  22. Which of the following elements is obtained from sea weeds ?
  23. The chemial name of Uria is
  24. The type of glass used in making prisms and lenses is
  25. The speed of light with the rise in the temperature of the medium
  26. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  27. Nitrification means
  28. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  29. Permanent hardness of water can be removed by adding
  30. Rust is