4. The major constituent of air is

6. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

7. The molecules of which gas have highest speed?

9. Dry powder fire extinguishers contain

10. The percentage of Nitrogen in Air is

11. The main active constituent of tea and coffee is

12. The metal that is used as a catalyst in the hydrogenation of oils is

13. For extinguishing fire, we use

15. The inherited traits of an organism are controlled by

17. Air is said to be saturated when :

18. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

20. The most abundant constituent of atmospheric air is :

25. Carbon dioxide is

26. Diamond is harder than graphite because of :

27. The heat required to raise the temperature of body by 1 K is called

28. Which of the following phenomenon is considered responsible for Global Warming?

29. The hardest form of carbon is

30. The number of g-molecule of oxygen in 6.02 x 10²⁴ CO molecules is

32. The gas used in the manufacture of vanaspati from vegetable oil is

34. The main buffer system of the human blood is

35. The iron ore magnetite consists of

36. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

40. The most electropositive elements among the following is

42. The mass of one Avogadro number of helium atom is

45. Which among the following coal contains 90 per cent of carbon?

46. The monomer of polythene is

47. One carat of diamond is equal to

48. The method that cannot be used for removing permanent hardness of water is

50. The nucleus of a hydrogen atom consists of

51. The octane number of zero is assigned to

52. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

53. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2^nd orbit to 3^rd orbit is

54. The number of moles of solute present in 1 kg of a solvent is called its

57. The material which can be deformed permanently by heat and pressure is called a

58. The heat energy produced when the human body metabolises 1 gram of fat is

62. Which is the highest quality of hard coal?

64. The inert gases are ____ in water.

66. Dry ice is the solid form of :

67. The ionic radii of N^3-, O^2-, F^– and Na⁺ follows the order

70. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

71. The number of d-electrons in Fe²⁺ (Z = 26) is not equal to that of

72. The luster of a metal is due to

73. The major constituent of air is

74. The oldest rocks in the earth’s crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth’s early life and solidified into hard rock’s called

75. The maximum number of covalent formed by nitrogen is

77. The number of waves in n x 10^th Bohr’s orbit are

78. The maximum number of isomers for an alkene with molecular formula C₄H₈ is

79. The most commonly used bleaching agent is

82. The gas used to extinguish fire is

83. The mineral containing both magnesium and calcium is

85. Diamonds are glittering and attractive because light incident on them undergoes

86. The hydronium ion is

87. The most important ore of aluminium is

89. The hottest part of the gas flame is known as

90. The mass of P₄O₁₀ that will be obtained from the reaction of 1.33 gram of P₄ and 5.07 of oxygen is

93. The main source of Naphthalene is

95. The most malleable metal is

97. Dry ice is

98. The organic reaction represented by equation CH₃ – CH = O + H₂NOH gives CH₃ – CH – NH + H₂O is an example of

99. The nucleus of an atom consists of

100. The National Chemical Laboratory is situated in