81. The buffer action of blood is due to the presence of
82. Bakelite is a co-polymer of Phenol and
83. Which of the following is not an addition polymer?
84. The polymer used in making plastic crockery is
85. The polymerisation of which often following is used in manufacturing of polythene in industry ?
86. Natural rubber is the polymer of :
87. The basic chemical building block of natural rubber obtained from trees is
88. The name of plastic polymer from which combs, toys, bowls etc., can be made, is
89. A polymeric substance used to make parachute is
90. PVC is obtained by the polymerisation of
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