31.

Bullet proof helmets are made from

• lexan

• saran

• glyptal

• thiokol

A thermoplastic among the following is

• bakelite

• polystyrene

• terylene

• urea-formaldehyde resin

The monomers used for their preparation of nylon 2-nylon 6 is/are

• caprolactam

• alanine and amino caproic acid

• glycine and amino caproic acid

• hexamethylenediamine and adipic acid

Zeigler-Natta catalyst is used in the preparation of

• low density polythene

• high density polythene

• dacron

• teflon

Match List-I with List-II and select the correct answer using the codes given below

List-I	List-II
(Polymers)	(Monomers)
1. Buna-N	A. Phthalic acid and ethylene glycol
2. Nylon-6,6	B. Terephthalic acid and ethylene glycol
3. Dacron	C. Hexamethylene diamine and adipic acid
4. Glyptal plastic	D. Isobutylene and isoprene E. Acrylonitrile and butadiene

• 1 - E; 2 - C; 3 - B; 4 - A

• 1 - B; 2 - A; 3 - D; 4 - E

• 1 - D; 2 - C; 3 - B; 4 - A

• 1 - E; 2 - C; 3 - B; 4 - A

Which one of the following is a co-polymer?

• Polyethylene

• Polyvinyl chloride

• Polytetrafluoroethylene

• Nylon-6,6

The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity index of the polymer is :

• < 1

• >1

• 1

• 0

Which one of the following statement is wrong?

• The IUPAC name of [Co(NH₃)₆Cl₃] is hexamine cobalt (III) chloride

• Dibenzol peroxide is a catalyst in the polymerization of PVC

• Borosilicate glass is heat resistant

• Concentrated HNO₃ can be safely transported in aluminium containers

Which of the following is not a thermoplastic?

• Polystyrene

• Teflon

• Novalac

• Polyvinyl chloride

The catalyst used for the polymerization of olefins is :

• Ziegler-Natta catalyst

• Wilkinson's catalyst

• Pd-catalys

• Zeise's salt catalyst