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

3. The iron ore magnetite consists of

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

5. Diamond is harder than graphite because of :

6. 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

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

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

17. The most malleable metal is

18. The hardest form of carbon is

20. The nucleus of a hydrogen atom consists of

22. The main source of Naphthalene is

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

24. The inherited traits of an organism are controlled by

25. The most important ore of aluminium is

28. 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

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

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

31. Carbon dioxide is

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

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

36. Dry ice is the solid form of :

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

39. The main active constituent of tea and coffee is

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

42. The main buffer system of the human blood is

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

44. The mineral containing both magnesium and calcium is

46. The major constituent of air is

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

48. The gas used to extinguish fire is

49. Air is said to be saturated when :

51. Which is the highest quality of hard coal?

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

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

55. For extinguishing fire, we use

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

57. One carat of diamond is equal to

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

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

63. The molecules of which gas have highest speed?

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

68. Dry ice is

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

72. The luster of a metal is due to

76. The nucleus of an atom consists of

77. The most electropositive elements among the following is

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

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

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

85. The octane number of zero is assigned to

87. The monomer of polythene is

88. The percentage of Nitrogen in Air is

91. The National Chemical Laboratory is situated in

92. The inert gases are ____ in water.

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

94. The most abundant constituent of atmospheric air is :

95. The maximum number of covalent formed by nitrogen is

96. The hydronium ion is

97. Dry powder fire extinguishers contain

98. The most commonly used bleaching agent is

100. The major constituent of air is