91.
Match the polymers in column $$- A$$ with their main uses in column $$- B$$ and choose the correct answer :
$$\eqalign{
& {\text{Column - A }}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{Column - B}} \cr
& {\text{(A) Polystrene }}\,\,\,\,\,\,{\text{(i) Paints and lacquers}} \cr
& {\text{(B) Glyptal }}\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{(ii) Rain coats}} \cr
& {\text{(C) Polyvinyl }}\,\,\,\,\,\,\,\,{\text{(iii) Manufacture of toys}} \cr
& \,\,\,\,\,\,\,\,\,{\text{chloride}} \cr
& {\text{(D) Bakelite }}\,\,\,\,\,\,\,\,\,\,\,{\text{(iv) Computer discs}} \cr} $$
A
(A) - (ii), (B) - (i), (C) - (iii), (D) - (iv)
B
(A) - (ii), (B) - (iv), (C) - (iii), (D) - (i)
C
(A) - (iii), (B) - (iv), (C) - (ii), (D) - (i)
D
(A) - (iii), (B) - (i), (C) - (ii), (D) - (iv)
Answer :
(A) - (iii), (B) - (i), (C) - (ii), (D) - (iv)
92. Which of the following organic compounds polymerizes to form the polyester Dacron?
A
Propylene and para $$HO - \left( {{C_6}{H_4}} \right) - OH$$
B
Benzoic acid and ethanol
C
Terephthalic acid and ethylene glycol
D
Benzoic acid and para $$HO - \left( {{C_6}{H_4}} \right) - OH$$
Answer :
Terephthalic acid and ethylene glycol
93. Which pair of polymers have similar properties ?
A
$${\text{Nylon, }}PVC$$
B
$$PAN,{\text{ }}PTFE$$
C
$$PCTFE,{\text{ }}PTFE$$
D
$${\text{Bakelite, alkyl resin}}$$
Answer :
$$PCTFE,{\text{ }}PTFE$$
94. Arrange the following polymers in an increasing order of intermolecular forces : fibre, plastic, elastomer.
A
Elastomer < Fibre < Plastic
B
Elastomer < Plastic < Fibre
C
Plastic < Elastomer < Fibre
D
Fibre < Elastomer < Plastic
Answer :
Elastomer < Plastic < Fibre
95. $$cis$$ - Polyisoprene possesses elastic property because
A
it is soft and soluble in non-polar solvent
B
it is unsaturated and porous
C
it has a coiled structure and chains held together by weak van der Waals' forces
D
it has a fibrous structure and reactive sites at various double bonds.
Answer :
it has a coiled structure and chains held together by weak van der Waals' forces
96.
Match the column I with column II and mark the appropriate choice.
Column I
Column II
a.
Raincoats, hand bags
1.
$$PHBV$$
b.
Laminated sheets
2.
$$PVC$$
c.
Television cabinets
3.
Urea-formaldehyde resin
d.
Orthopaedic devices
4.
Polystyrene
A
a - 1, b - 2, c - 3, d - 4
B
a - 4, b - 1, c - 2, d - 3
C
a - 2, b - 3, c - 4, d - 1
D
a - 3, b - 4, c - 1, d - 2
Answer :
a - 2, b - 3, c - 4, d - 1
97. $$C{F_2} = C{F_2}$$ is a monomer of
A
buna - $$S$$
B
teflon
C
glyptal
D
nylon - 6
Answer :
teflon
98. Nylon 6, 6 is obtained by condensation polymerisation of
A
adipic acid and ethylene glycol
B
adipic acid and hexamethylenediamine
C
terephthalic acid and ethylene glycol
D
adipic acid and phenol
Answer :
adipic acid and hexamethylenediamine
99. If $${N_1},{N_2},{N_3}.....{N_i}$$ are the number of molecules with molecular masses $${M_1},{M_2},{M_3}......{M_i}$$ respectively, then the number average molecular mass $$\left( {{{\bar M}_n}} \right)$$ is given by
A
$$\frac{{\sum {{N_i}M_1^2} }}{{\sum {{N_i}{M_i}} }}$$
B
$$\frac{{\sum {{N_i}{M_i}} }}{{\sum {{N_i}} }}$$
C
$$\frac{{\sum {M_t^2} }}{{\sum {{N_i}} }}$$
D
$$\frac{{\sum {{N_i}{M_i}} }}{{\sum {{M_i}} }}$$
Answer :
$$\frac{{\sum {{N_i}{M_i}} }}{{\sum {{N_i}} }}$$
100. Natural rubber is a polymer of
A
1, 1-dimethylbutadiene
B
2-methyl-1, 3-butadiene
C
2-chlorobuta-1, 3-diene
D
2-chlorobut-2-ene
Answer :
2-methyl-1, 3-butadiene
