The major ingredient of leather is

A. Nucleic acid

B. Carbohydrate

C. Collagen

D. Polymer

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  1. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  2. The fastest-running terrestrial animal is
  3. The intencity of Earthquakes is measured on
  4. The solar eclipse occurs when
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  6. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
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  13. The formula of Plaster of Paris is
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  16. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  17. One fathom is equal to
  18. The major ingredient of leather is
  19. Permanent hardness of water can be removed by adding
  20. The most important ore of Aluminium is
  21. Nitrification means
  22. The element present in the largest amount in rocks and minerals is
  23. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  24. Quartz crystals normally used in quartz clocks etc. is chemically
  25. Rust is
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