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

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

5. Dry ice is

8. The nucleus of a hydrogen atom consists of

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

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

11. The most abundant constituent of atmospheric air is :

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

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

15. For extinguishing fire, we use

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

20. The most malleable metal is

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

24. The mineral containing both magnesium and calcium is

28. The National Chemical Laboratory is situated in

30. The most commonly used bleaching agent is

32. The octane number of zero is assigned to

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

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

42. The percentage of Nitrogen in Air is

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

46. The major constituent of air is

47. Which is the highest quality of hard coal?

49. Diamond is harder than graphite because of :

50. The hydronium ion is

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

52. The inert gases are ____ in water.

53. The gas used to extinguish fire is

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

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

56. The hardest form of carbon is

57. The iron ore magnetite consists of

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

62. 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

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

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

65. Dry powder fire extinguishers contain

66. The most electropositive elements among the following is

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

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

74. Air is said to be saturated when :

75. The luster of a metal is due to

76. 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 main source of Naphthalene is

80. The major constituent of air is

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

83. The main active constituent of tea and coffee is

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

87. The molecules of which gas have highest speed?

88. Carbon dioxide is

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

90. The main buffer system of the human blood is

91. The inherited traits of an organism are controlled by

92. One carat of diamond is equal to

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

95. The monomer of polythene is

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 nucleus of an atom consists of

99. Dry ice is the solid form of :

100. The most important ore of aluminium is