81.
The buffer action of blood is due to the presence of

82.
Bakelite is a co-polymer of Phenol and

84.
The polymer used in making plastic crockery is

85.
The polymerisation of which often following is used in manufacturing of polythene in industry ?

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