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

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

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

12. The major constituent of air is

13. 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

14. Diamond is harder than graphite because of :

16. The nucleus of an atom consists of

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

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

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

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

27. Air is said to be saturated when :

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

29. The major constituent of air is

32. The most abundant constituent of atmospheric air is :

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

35. Dry powder fire extinguishers contain

37. The monomer of polythene is

38. Dry ice is the solid form of :

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

40. One carat of diamond is equal to

41. The molecules of which gas have highest speed?

42. The most commonly used bleaching agent is

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

47. Dry ice is

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

49. Which is the highest quality of hard coal?

50. For extinguishing fire, we use

51. The hydronium ion is

52. Carbon dioxide is

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

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

59. The inert gases are ____ in water.

60. The maximum number of covalent formed by nitrogen is

61. The octane number of zero is assigned to

62. The main active constituent of tea and coffee is

64. The most electropositive elements among the following is

66. The nucleus of a hydrogen atom consists of

68. The most important ore of aluminium is

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

70. The main source of Naphthalene is

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

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

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

76. The gas used to extinguish fire is

77. The National Chemical Laboratory is situated in

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

81. The percentage of Nitrogen in Air is

82. The luster of a metal is due to

83. The most malleable metal is

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

85. The iron ore magnetite consists of

87. The mineral containing both magnesium and calcium is

88. The main buffer system of the human blood is

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

93. The hardest form of carbon is

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

97. 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

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

99. The inherited traits of an organism are controlled by

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