In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000, and the rest- 60,000. What is the weight average molecular mass= of the polymer?

(1) 40,300

(2) 30,600

(3) 43,333

(4) 50,400

Which of the following are correct here?

(1) ABS plastic

(2) Contains three monomers

(3) A polymer of acrylonitrile, butadiene, and styrene

1. 1 and 2

2. 3 only

3.  2 only

4.  1, 2, and 3

Which is/are correct about PMMA here

(I) It is called plexiglass
(II) It is hard and transparent
(III) For its formation peroxide is used
(IV) It is co-polymer

(1) I, II

(2) II, III

(3) 1, IIl

(4) I, II, III, IV

Polyacrylonitrile, characterized by the  repeating unit is made from the monomer: 

1. ${\mathrm{CH}}_2=\mathrm{CHCN}$

2. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CN}$

3. ${\mathrm{HOCH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$

4. ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CHCN}$

The monomer used for the manufacture of PVC is obtained by the addition of -

1. ${\mathrm{Cl}}_2$ to ethylene

2. ${\mathrm{Cl}}_2$ to acetylene

3. HCl to ethylene

4. HCl to acetylene in presence of ${\mathrm{Hg}}^{2+}$ salts

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

1. < 1

2. > 1

3. 1

4. 0

$\left[\mathrm{NH}\right({\mathrm{CH}}_2\left)\mathrm{NHCO}\right({\mathrm{CH}}_2{)}_4\mathrm{CO}]\mathrm{n}\text{ is a }$

(1) thermosetting polymer

(2) homopolymer

(3) co-polymer

(4) addition polymer

Bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an example of

(1) Free radical reaction.

(2) Aromatic nucleophilic substitution.

(3) Aromatic electrophilic substitution.

(4) Aldol reaction.

True statements regarding polymers are: 

a. Polymers have a low molecular weight.

b. Polymers have high viscosity.

c. Polymers scatter light.

d. Polymers do not carry any charge.

1. a, b and c

2. a, b and d

3. b, c and d

4. a, c and d

Which of the following cannot be used as a plasticizer?

1. 

2. 

3. cresyl triphosphate

4. Di- n-octyl phthalate