CHM205

1. Hydrazine is used as a ________ along with liquid air or oxygen as oxidant.

2. PVC pipes are manufactured using ____________

3. Lead dioxide is used as ___________

4. ___________are the fibrous silicates, having high tensile strength and heat/fire resistance, used as insulators and steam pipe lagging.

5. _____________ is the only liquid halogen.

6. Which of the group V metals can not be obtained from its sulphide ore?

7. The group of elements in the periodic table that is associated with semiconductor properties is ___________

8. The halogen _______ is solid at room temperature

9. The only halogen that can oxidize chlorine is __________

10. Of the group IV element, the one that exhibits anomalous behaviour is ___________

11. The molecular formula of hydrazine is ________

12. The ‘great balls of carbon’ in which carbon atoms are symmetrically arranged in closed shells are known as __________

13. The second most abundant element in the earth’s crust after oxygen is __________

14. A derivative of ____________ is used in making photographic plates

15. Which of these is not an interstitial carbide?

16. Zeolites are also called ____________

17. All group V elements except ____________ react with sulphur to form sulphides.

18. Ammonia acts as a Lewis base because it possesses a _________

19. Which of these is not a raw material for the cement manufacture?

20. The hybridization of nitrogen in ammonia is ___________

21. The purest form of silicon dioxide is ___________

22. Deficiency of one of these leads to goitre in humans

23. Conversion of nitrogen into its compounds is known as _________

24. Bacteria which convert nitrogen compounds into free nitrogen are known as ___________ bacteria

25. Nitriles are oxidized to nitrates by ___________

26. Mixed chloroflorocarbons are known as _________

27. Arsenic has a _____________ odour

28. When carbon is linked to elements of lower or approximately the same electronegativity,the binary compounds formed are termed

29. Which of these is not a carbide?

30. Nitrogen is obtained commercially from ___________

31. Which of the group V elements give only one oxidation state?

32. ____________ has the highest electronegativity value

33. A derivative of ------------- is used in making photographic plates

34. The form of carbon that conducts electricity is _________

35. The ground state electronic configuration of phosphorus is ___________

36. One of these is not a form of silica?

37. Zeolites is used in water as____________

38. ___________ is obtained when of silicates mainly of sodium and calcium is melted and supercooled

39. Of all halogens, _____________ has the highest ionization energy

40. The element known as ‘super halogen’ is _________

41. Which of these is not a group V element?

42. ____________is a property by virtue of which elements form long chain compounds by single or multiple bonds between atoms of the same element.

43. Which of these is not a component of lead-acid battery?

44. The heavier elements of group IV functions as ___________

45. Continuous exchange of nitrogen between the atmosphere and the biosphere is called ___________

46. The most metallic element in group IV is __________

47. The halogen which has only two complete electron shells below the valence shell is _______

48. Which of these is true of interstitial carbide?

49. The oxide of nitrogen which is colourless and rather unreactive is _________

50. Silicates are salts of______