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

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  1. The chemial name of Uria is
  2. The property of a substance to absorb moisture from the air on exposure is called
  3. The Panda belongs to the same family as that of
  4. The metallic constituents of hard water are
  5. Which of the following characters is not shown by hydrogen
  6. The removal of top soil by water or wind is called
  7. According to Daltons atomic theory the smallest particle which can exist independently is
  8. The metal that is present in Photo Films is
  9. Which of the following is in liquid form at room temperature ?
  10. The recent atomic weight scale is based on
  11. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  12. Which of the following elements is non-radioactive?
  13. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  14. Which of the following is commonly called a polyamide ?
  15. The type of glass used in making prisms and lenses is
  16. Water has maximum density at
  17. The fastest-running terrestrial animal is
  18. The hardest substance available on earth is
  19. Glass is made from the mixture of
  20. Quartz crystals normally used in quartz clocks etc. is chemically
  21. Lightening cause rainfall because
  22. Cell membrane is
  23. Rust is
  24. Epoxy resins is used as
  25. The colour of Emerald is
  26. The major ingredient of leather is
  27. Old-written material, which cannot be read easily can be read by
  28. The oxide of Nitrogen used in medicine as anaesthetic is
  29. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  30. Permanent hardness of water can be removed by adding