Bullet proof helmets are made from
lexan
saran
glyptal
thiokol
A.
lexan
Bulletproof helmets are made up of lexan. It is a polycarbonate polymer nearly as tough as steel. It is used in bulletproof windows and as face plates in the helmets worn by astronauts. Lexan is made by condensing phosgene with a diphenol with the elimination of HCl.
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
The catalyst used for the polymerization of olefins is :
Ziegler-Natta catalyst
Wilkinson's catalyst
Pd-catalys
Zeise's salt catalyst