The most important ore of Aluminium is

A. Calamine

B. Calcite

C. Galena

D. Bauxite

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  1. The metallic constituents of hard water are
  2. The formula of Plaster of Paris is
  3. The metal used in storage batteries
  4. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  5. Apparatus invented by Archimedes is :
  6. Lightening cause rainfall because
  7. Quartz crystals normally used in quartz clocks etc. is chemically
  8. The solar eclipse occurs when
  9. The smallest functional and structural unit of kidney is called as
  10. Water has maximum density at
  11. Old-written material, which cannot be read easily can be read by
  12. Which of the following is the lightest metal ?
  13. The most important ore of Aluminium is
  14. The oxide of Nitrogen used in medicine as anaesthetic is
  15. Pollination by birds is called
  16. Brass gets discoloured in air due to the presence of which gas in air
  17. The element present in the largest amount in rocks and minerals is
  18. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  19. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  20. The removal of top soil by water or wind is called
  21. Nitrification means
  22. Which of the following is commonly called a polyamide ?
  23. Which of the following characters is not shown by hydrogen
  24. Cell membrane is
  25. Which of the following is in liquid form at room temperature ?
  26. In an atomic nucleus, neutrons and protons are held together by
  27. Epoxy resins is used as
  28. The speed of light with the rise in the temperature of the medium
  29. The intencity of Earthquakes is measured on
  30. Which of the following elements is a metal