Chapter 30: Problem 12
Which of the following contains isoprene units? (a) natural rubber (b) Nylon-6, 6 (c) polyethylene (d) Dacron
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If \(\mathrm{N}_{1}, \mathrm{~N}_{2}, \mathrm{~N}_{3} \ldots \mathrm{N}_{\mathrm{i}}\) are the number of molecules with molecular masses \(M_{1}, M_{2}, M_{3} \ldots M_{i}\) respectively, then the number average molecular mass \(\left(\bar{M}_{w}\right)\) is given by (a) \(\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}^{2}}{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}\) (b) \(\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}{\sum \mathrm{N}_{\mathrm{i}}}\) (c) \(\frac{\sum \mathrm{M}_{\mathrm{i}}^{2}}{\sum \mathrm{N}_{\mathrm{i}}}\) (d) \(\frac{\sum \mathrm{N}_{i} \mathrm{M}_{\mathrm{i}}}{\sum \mathrm{M}_{\mathrm{i}}}\)
Which of the following is chemical name of 'melamine'? (a) \(1,3,5\)-triamino- \(2,4,6\)-triazine (b) \(2,4,6\)-triamino- \(1,3,5\)-triazine (c) 2 -amino- \(1,3,5\)-triazine (d) 2,4 -diamino- \(1,3,5\)-triazine
Polymer is a very large molecule that is made up of repeating small molecular units called monomers. The chemical reaction that unites the monomers is called polymerization.There are homopolymers, copolymers depending upon the type of monomers present in them. Following is the example of \(\mathrm{nA}+\mathrm{nB} \rightarrow-\mathrm{B}-\mathrm{B}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{B}-\mathrm{B}\) \(-\mathrm{B}-\mathrm{B}-\mathrm{B}-\mathrm{B}-\mathrm{A}-\mathrm{A}-\) (a) Alternate copolymer (b) Block copolymer (c) Graft copolymer (d) Random copolymer
Match the following $$ \begin{array}{ll} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { (a) Nylon 6, } 6 & \text { (p) Polyester } \\ \text { (b) Dacron } & \text { (q) Polyamide } \\ \text { (c) Teflon } & \text { (r) Condensation polymer } \\ \text { (d) Bakelite } & \text { (s) Addition polymer } \\ & \text { (t) } \mathrm{C}_{2} \mathrm{~F}_{4} \\ \hline \end{array} $$
Match the following: List I List II (Polymer) (Polymerizing units) 1\. Bakelite (i) Butadiene and styrene 2\. Dacron (ii) Phenol and methanal 3\. Nylon-66 (iii) 1,2 -dihydrooxyethane and dimethyl terephthalate 4\. Buna-S (iv) Urea and methanal (v) 1,6 -hexanedioic acid and 1 , 6 -diamino hexane The correct matching is: \(\begin{array}{llll}1 & 2 & 3 & 4\end{array}\) (a) (iii) (v) (ii) (iv) (b) (ii) (iii) (iv) (i) (c) (iv) (iii) (v) (i) (d) (ii) (iii) (v) (i)
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