71. The National Chemical Laboratory is situated in
72. Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
73. The mass number of an atom is equal to
74. The maximum number of covalent formed by nitrogen is
75. The formula C6H5-CO-CH3 represents
76. The metal that is usually extracted from sea water is
77. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
78. The inert gases are ____ in water.
79. The molecular formula of phosphorous is
80. The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
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