Put the mark $()$ beside the correct answers and the mark $($x$)$ beside

incorrect ones:

$(1)$ Poly styrene is a step polymer

$(2)$ Nylon is a step polymer

$(3)$ Polymers have very high boiling and melting points

$(4)$ Thermoplastic polymers may be recycled

$(5)$ Molar mass of addition polymers increases as time is increased.

$(6)$ Molar mass of step polymers increases as time is increased.

$(7)$ Soap is used in emulsion and suspension polymerization

$(8)$ Polybutadiene is a step polymer

$(9)$ Increase of initiator concentration increases the molar mass of

addition polymers.

$(10)$ Cationic polymerization have positive active centre

$(11)$ Automobile tires are thermoplastic polymers

$(12)$ Mw is always higher than Mn

$(13)$ Mw May be equal to Mn

$(14)$ Mn may be higher than Mw

$(15)$ Polydispersity index may be equal one

$(16)$ Fibers are crystalline polymers

$(17)$ Rubbers are highly crystalline polymers

$(18)$ Polyethylene and PVC are crystalline polymers

$(19)$ Polystyrene and PVC are elastomers

$(20)$ Polyethylene has high Tm and Tg values

$(21)$ Elastomers and fibers have high modulus

$(22)$ Rigid plastics have high modulus and high Tg values

$(23)$ Rubbers have low Tg values

$(24)$ Rubbers are complete Crystalline polymers$(25)$ Rubbers are complete amorphous polymers

$(26)$ Fibers are highly crystalline polymers

$(27)$ Rigid plastics and fibers are crystalline polymers

$(28)$ Flexibility of polymers increases as Tg icreases

$(29)$ As crosslinking degree increases Tg increases

$(30)$ As crosslinking degree increases flexibility increases