LDC Special .... ELEMENTS 1. Most abundant element in the Universe? Answer: Hydrogen 2. Number of discovered elements? Answer: 120 3. Names are given to ........... elements? Answer: 112 4. 112th element in periodic table? Answer: Coppernicium 5. 43rd element in periodic table? Answer: Technetium 6. First artificial element? Answer: Technetium 7. Lightest gas at S.T.P? Answer: Hydrogen 8. Simplest element gas? Answer: Hydrogen 9. Element Common to all acids? Answer: Hydrogen 10. Most abundant element in the human body? Answer: Oxygen 11. Most common element by weight in Earth’s crust? Answer: Oxygen 12. Most ductile element? Answer: Gold 13. Most conductive metal? Answer: Silver 14. Most abundant metallic element in the human body? Answer: Calcium 15. Most abundant element in the earth’s atmosphere? Answer: Nitrogen 16. Most abundant metallic element in the earth’s crust? Answer: Aluminium 17. The metal most used for house hold purpose? Answer: Aluminium 18. The metal contained in clay? Answer: Aluminium 19. The heaviest gaseous element? Answer: Radon 20. Rarest element in the earth’s atmosphere? Answer: Radon 21. Heaviest noble gas? Answer: Radon 22. Element stored in Kerosene to prevent oxidation? Answer: Sodium 23. The lightest metal element? Answer: Lithium 24. Least dense metal? Answer: Lithium 25. Least stable radioactive Isotope? Answer: Lithium-5 26. The rarest naturally occurring element in the earth’s crust? Answer: Astatine 27. Element with highest melting and boiling points? Answer: Tungsten 28. Element used to make electric bulb filament? Answer: Tungsten 29. Which is known as ‘wolfram’? Answer: Tungsten 30. Highest thermal expansion? Answer: Caesium 31. A bleaching agent? Answer: Chlorine 32. The second most chemically active element? Answer: Chlorine 33. The densest element? Answer: Osmium 34. Most chemically active element? Answer: Fluorine 35. Most electronegative element of the periodic table? Answer: Fluorine 36. The radioactive gaseous element? Answer: Radon 37. The second hardest natural substance? Answer: Corundum 38. The crystalline form of Aluminium oxide? Answer: Corundum 39. The Largest Atom? Answer: Francium 40. Lowest atomic volume? Answer: Boron 41. Most abundant carbon compound in the nature? Answer: Cellulose 42. Most stable radioactive Isotope? Answer: Tellurium-130 43. Most toxic radioactive Isotope in air? Answer: Thorium-238 44. Most toxic non-radioactive element in air? Answer: Beryllium 45. Hardest substance in the world? Answer: Diamond 46. White phosphorus is kept in? Answer: Under water 47. The phosphorus used in the manufacture of match boxes? Answer: Red phosphorus 48. Ore of Uranium? Answer: Pitchblende 49. Heavy hydrogen is: Answer: Deuterium 50. Gas used to fill electric bulb used for advertisement? Answer: Neon
Posted on: Tue, 03 Sep 2013 03:55:19 +0000