Polythene is industrially prepared by the polymerisation of

A. styrene

B. methane

C. ethylene

D. acetylene

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  1. When a gas is turned into a liquid, the process is called
  2. Rust is
  3. Which of the following elements is non-radioactive?
  4. Bromine is
  5. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  6. The location and energy of an electron in an atom can be specified by
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  8. Nitrification means
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  13. The metal used in storage batteries
  14. Cell membrane is
  15. One fathom is equal to
  16. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  17. The metal that is present in Photo Films is
  18. The removal of top soil by water or wind is called
  19. Permanent hardness of water can be removed by adding
  20. The fastest acting enzyme in the biological kingdom is
  21. Pollination by birds is called
  22. Liquefied Petroleum gas (LPG) consists of mainly
  23. Which of the following elements is obtained from sea weeds ?
  24. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  25. Which of the following is commonly called a polyamide ?
  26. The type of glass used in making prisms and lenses is
  27. Which of the following is in liquid form at room temperature ?
  28. The hardest substance available on earth is
  29. The chemial name of Uria is
  30. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?