81. Which of the following coals has the highest calorific value?
82. Bleaching action of bleaching powder is due to its __________ properties.
83. RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
84. Dechlorination of treated water is necessary to
85. Deaeration of water in its treatment is necessary, as it
86. Phenol formaldehyde resin is used as an adhesive in making
87. Solvent used for extraction of oil is
88. Soap cannot be used with hard water, because
89. Which glass is usually used in optical work?
90. The purpose of adding Na2CO3 to water of low alkalinity is to
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