81. Synthetic detergents are prepared from
82. What is a mixture of potassium nitrate, powdered charcoal and sulphur called?
83. Iodex, a pain relief balm, has the smell of ________ .
84. Silver halides are used in photographic plates because they are
85. Who developed Hydrogen Bomb?
86. Synthetic detergents are made from
87. Commonly used antiseptic 'Dettol' is a mixture of
88. The gas used in the artificial ripening of fruits is
89. The common refrigerant in domestic refrigerator is
90. The chemical used in embalming biological materials is
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