81. Bordeaux mixture is a/an
82. The noble gas which occurs most abundantly in the atmosphere is
83. BHC (Benzene hexachloride) is made by the chlorination of benzene
84. Multistage catalytic converter is not used in the
85. Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
86. Sand and __________ is fused at 1300°C, to produce sodium silicate.
87. Ca(OH)2 is called
88. Calcination of gypsum produces
89. CaO is called
90. High temperature carbonisation of coal produces
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