2. Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful

3. The depletion of ozone layer is due to

4. Cement is formed by strongly heating a mixture of

5. The chemical name of ‘Plaster of Paris’ commonly used for setting broken bones is

7. The chemical substance present in bones and teeth is

9. Asbestos is formed of :

11. Chile saltpeter is the common name of:

13. Aluminium salt commonly used to stop bleeding is

14. Limestone is a raw material used by which industry?

16. Sullage water is –

20. Bayer’s reagent is

22. What is the most common salt in sea water ?

23. The length of double bond is _______ than single bond.

25. The chemical name of quartz is

27. The common name of sodium bicarbonate is

28. How many electrons can be accommodated in d-orbital?

29. Which one of the following organic compounds has fruity smell?

32. High concentration hydrocarbon pollutants in atmospheric air causes

34. A subshell with l = 2 can take up

35. Taj Mahal is greatly affected due to :

38. The compound that has the least value for octane number is :

40. An element of atomic no. 29 belongs to

41. Coating of solid waste with impervious material is known as

44. Cement is usually a mixture of :

45. Which one of the following forms of phosphorus is most reactive?

47. Who modified Bohr’s theory by introducing elliptical orbits for electron path?

49. Which of the following is secondary air pollutant ?

50. Calcium salts used as fertilizer is :

51. Heavy metal pollution of water is caused by:

52. The oxidation number of nickel in K₄[Ni(CN)₄] is

53. Heavy metals got their name because compared to other atoms they have

54. Baryllium Sulphate is less soluble in water due to

55. Which one is not a primary greenhouse gases in the Earth’s atmosphere?

56. Two electrons in an orbital are differentiated by which of the following ?

58. Sodium bicarbonate is commercially known as

59. Which amidst the following is not a gem stone ?

60. Oxygen has (+) oxidation number only in

62. How many neutrons are there in ₉₂U²³⁸ atom ?

63. Which metal is the heaviest in periodic table among the following ?

65. The element absorbed both in cation and anion form is

68. Persons working in cement plants and lime stone quarries are prone to disease like

69. Which one of the following elements is used in the manufacture of fertilizers ?

73. Chemical composition of cement is

75. An example of heterocyclic compound is

76. Which of the following is not a precious/semi-precious stone?

77. Bone ash contains

78. Which of the following is not a gaseous air pollutant?

79. Black lung disease occurs in people working in

80. Chemical name of vinegar is

82. Setting of plaster of pairs involves

85. Which of the following molecules has a bond order of 2.5?

87. Which one of the following was used as a chemical weapon in the first world war ?

88. Commercially, sodium bicarbonate is known as

89. Threshold limit value of copper in the atmospheric air is

90. Cement containing excess amount of lime

92. Which of the following is used to denature ethanol ?

93. Acid rain is caused due to emission of which of the following into the atmosphere ?

94. What is the atomic number of mercury?

96. Sulphur dioxide present in the industrial chimney exhaust causes

97. The least preferred technique in the disposal of Municipal Solid Waste is

98. Cement is made hard with

100. When cathode rays strike a target of high atomic weight, they give rise to