81. __________ is the major constituent of the Portland cement.
82. The product obtained on mixing calcium oxide with water is called
83. Kaoline is a/an
84. Coke oven gas consists mainly of
85. Commonly used glass is known as the __________ glass.
86. Kopper-Totzek coal gasifier
87. Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
88. The amount of benzene present in pure benzol is about __________ percent.
89. Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.
90. The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
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