76.  Charcoal is used in water treatment as a/an-

77.  Water gas is a Mixture of-

78.  What is the chemical composition of Heavy Water?

79.  Heating of ore in the absence of air below its melting point is called

80.  Water can be separated from the mixture of water-Alcohol by the process-

81.  Iron and Manganese are removed by the process of-

82.  Enzyme which coagulate the milk into curd-

83.  Which gas is used for converting vegetable oils into saturated fats -

84.  Gas used as a fire extinguisher is

85.  Chemically Lime water is -

86.  Highly polluting industries comes under the category of-

87.  Process of Removal of calcium and Magnesium is known as -

88.  When Hydrogen combusts in air, then formed-

89.  Phenolics as Pollutant can be removed from waste water by use of-

90.  A Liquid is said to be boiled when its-