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

A. Carbon

B. Hydrogen

C. Aluminium

D. Silicon

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  2. Which of the following is in liquid form at room temperature ?
  3. The most important ore of Aluminium is
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  18. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  19. Pollination by birds is called
  20. Which of the following elements is obtained from sea weeds ?
  21. According to Daltons atomic theory the smallest particle which can exist independently is
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  24. Quartz crystals normally used in quartz clocks etc. is chemically
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  26. Bromine is
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