Question

33. The most reactive and the least reactive metal from the metals Na, Al, Cu, Ag.
34. The element in group 17 [VIIA] of the periodic table which is a liquid at ordinary temperatures,
35. The period which contains 8 elements including the non-metal sulphur.
30. The element in group 17 (VIIA) of the periodic table which bleaches vegetables
dyes by oxidation.
37. A hectahydrate salt containing iron.
38. The most reactive element in group 16 [VIA) of the periodic table.
39. The product obtained when nitrogen reacts with a neutral gas and the reaction is endothermic
40. A nitride of a divalent metal.
41. The displaced product when zinc reacts with copper sulphate solution
42. The colourless liquid obtained when the first element of group 14 (IVA), reacts with the
second element of group 16 [VIA) of the periodic table.
43. The least reactive element in group 15 [VA] of the periodic table.
44. The oxidation number of nitrogen in - nitric oxide.
45. A soluble salt formed by synthesis, when a trivalent metal, combines with a coloured
acidic gas.
46. The salt formed when zinc reacts with caustic potash solution.
47. The Law which states that -
a] The product of the volume and pressure of a given mass of dry gas is constant -
temperature remaining constant.
b] The volume of a given mass of any gas is directly proportional to its absolute temperature-
pressure remaining constant.
c] In a chemical reaction, the total mass of the reacting substances is equal to the total mass
of the products - masses measured under similar conditions.
48. The temperature scale with absolute zero as its starting point.
49. An element which is inactive and present in traces in the atmosphere.
50. A secondary pollutant from the primary pollutant nitric oxide.
51. The gaseous product of boiling a sample of temporary hard water, containing soluble
bicarbonates.
52. A a) positive radical b] negative radical - both containing the element 'H'.
53. A metal which shows variable valency of a] +1 & +2 b] +2 & +3 c] +2 & +4.
54. The source of inorganic material in sewage waste water.
55. A combustible neutral gas which is a non-supporter of combustion.
56. In the reaction - 2KI + H2O2 + 2KOH + 12. Name the oxidicing agent & oxidized product.
• Brz
57. The type of chemical reaction seen in the chemical change - Cl2 + 2KBr → 2KCI +
58. A trivalent metal which reacts with steam liberating hydrogen
59. The shell or energy level having a maximum of 8 electrons.
60. The atom which needs one electron to attain stable electronic configuration of the nearest noble
gas - helium.
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Answer 1

33. most reactive = Na , least = ag

34. Bromine

35. 3rd period

36. Iodine

37. FeSO4 . 7H2O

38. Oxygen

39. hydrogen cyanide

40. Mg3N2 Magnesium Nitride

41. Zn + CuSO4 ----> ZnSO4 + Cu

42. CS2 ... Carbon di sulphide

43. Nitrogen

44. +2

45. Al + Cl2 = AlCl3

46. Potassium Zincate

47.

a..Boyle's law

b.. Charles gas law

c. law or conservation of matter

48. Kelvin scale

49. Radon

50. NO .... nitrogen monoxide

Answer 2

33 most reactive is Na

least reactive is Ag

34 Bromine(Br) is liquid at room temperature

35 the period is 3rd

36 the element is Chlorine(Cl)

37 Ferrous sulphate (FeSO4)

38 polonium is most reactive in group 16

39 the product is Methane

40 Magnesium nitride is divalent metal

41 the product is zinc sulphate ZnSO4

42 CO2 is the product

43 Nitrogen the least reactive element in group 15

44 +2 is the number

45 salt formed is AlCl3 or FeCl3

46 ZnCl

47 c] Law of conservation of mass

48 Kelvin scale

49 Radon in the element

50 Nitrogen dioxide

51 carbon dioxide

52 positive radical - NH4

negative radical - HCO3

53 +1 - copper

+2 - iron

+ 3 - iron

±4 - carbon and tin

54 nitrate and phosphates

55 Nitrogen gas

56 H2O2 is oxidising agent

KI is oxidisied product

57 displacement reaction

58 Iron(Fe)

59 valence shell

60 the element is Hydrogen (H)