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X is used in the controlled release of drugs. The monomers of X are ?

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Important Questions on Polymers

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Polystyrene is?
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Which of the following statements is incorrect?
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Thermosetting polymers:

(a) are formed by condensation reaction.

(b) have cross-linked structure.

(c) are hard, rigid and brittle.

Correct statements are.

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The thermosetting plastic among the following is:
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Which of the following properties are associated with thermoplastics? 

(a) Linear polymers

(b) Highly cross-linked

(c) Slightly branched long chain molecules 

(d) Molded easily by heating 

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Which of the following is a natural polymer?
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Natural rubber is a
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Among: 

(a) Proteins 

(b) Starch 

(c) Nucleic acid

Which of these are natural polymers?