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The element present in the largest amount in rocks and minerals is

A. Carbon

B. Hydrogen

C. Aluminium

D. Silicon

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  1. Which of the following elements is obtained from sea weeds ?
  2. When a gas is turned into a liquid, the process is called
  3. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  4. The fastest acting enzyme in the biological kingdom is
  5. The type of glass used in making prisms and lenses is
  6. Nitrification means
  7. The removal of top soil by water or wind is called
  8. The smallest functional and structural unit of kidney is called as
  9. Earth's seasons are caused by which of the following?
  10. The formula of Plaster of Paris is
  11. The property of a substance to absorb moisture from the air on exposure is called
  12. Which of the following is in liquid form at room temperature ?
  13. The hardest substance available on earth is
  14. Which of the following elements is a metal
  15. Bromine is
  16. The major ingredient of leather is
  17. The speed of light with the rise in the temperature of the medium
  18. The solar eclipse occurs when
  19. Quartz crystals normally used in quartz clocks etc. is chemically
  20. The fastest-running terrestrial animal is
  21. Polythene is industrially prepared by the polymerisation of
  22. The marine animal called dugong which is vulnerable to extinction is a/an
  23. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  24. What is the unit for measuring the pitch or frequency of sound ?
  25. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  26. The metal used in storage batteries
  27. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  28. Lightening cause rainfall because
  29. According to Daltons atomic theory the smallest particle which can exist independently is
  30. The location and energy of an electron in an atom can be specified by