81. Temporary hardness of water can be removed by
82. Permanent hardness of water can be removed by
83. Permanent hardness of water can be removed by
84. Permanent hardness of water can be removed by
85. Esterification reaction
86. Polymethyl methacrylate (PMMA) is known as
87. The process used for the manufacture of ethyl alcohol from molasses is
88. Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.
89. Thermal pyrolysis of ethylene dichloride produces
90. Concentration of hydrogen peroxide is done by
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