71. Glycogen, a naturally occurring polymer stored in animals is a
A
monosaccharide
B
disaccharide
C
trisaccharide
D
polysaccharide
Answer :
polysaccharide
72. Bakelite is prepared by the reaction between
A
urea and formaldehyde
B
ethylene glycol
C
phenol and formaldehyde
D
tetramethylene glycol
Answer :
phenol and formaldehyde
73.
Fill in the blanks with suitable reagents to show synthesis of polyvinyl chloride.
A
$$X = HCl,HgC{l_2};$$ $$Y = {\text{Polymerisation, peroxide}}$$
B
$$X = C{l_2},FeC{l_3};$$ $$Y = {\text{Polymerisation, heat}}$$
C
$$X = HCl,CuCl;$$ $$Y = {H_2}O,{H^ + }$$
D
$$X = HCl,HgC{l_2};$$ $$Y = Pt,{\text{high pressure}}$$
Answer :
$$X = HCl,HgC{l_2};$$ $$Y = {\text{Polymerisation, peroxide}}$$
74. Which one of the following is used to make ‘non-stick’ cookware ?
A
$$PVC$$
B
Polystyrene
C
Polyethylene terephthalate
D
Polytetrafluoro ethylene
Answer :
Polytetrafluoro ethylene
75.
Match the column I with column II and mark the appropriate choice.
Column I
Column II
a.
Buna-$$N$$
1.
Phthalic acid and ethylene glycol
b.
Nylon-6, 6
2.
Terephthalic acid and ethylene glycol
c.
Dacron
3.
Hexamethylene diamine and adipic acid
d.
Glyptal plastic
4.
Acrylonitrile and butadiene
A
a - 2, b - 3, c - 4, d - 1
B
a - 1, b - 2, c - 4, d - 3
C
a - 3, b - 4, c - 1, d - 2
D
a - 4, b - 3, c - 2, d - 1
Answer :
a - 4, b - 3, c - 2, d - 1
76. Number average molecular mass, $${\bar M_n}$$ and weight average molecular mass $$\left( {{{\bar M}_w}} \right)$$ of synthetic polymers are related as
A
$${{\bar M}_n} = {\left( {{{\bar M}_w}} \right)^{\frac{1}{2}}}$$
B
$${{\bar M}_n} = {{\bar M}_w}$$
C
$${{\bar M}_w} > {{\bar M}_n}$$
D
$${{\bar M}_w} < {{\bar M}_n}$$
Answer :
$${{\bar M}_w} > {{\bar M}_n}$$
77.
\[n\left( C{{F}_{2}}=C{{F}_{2}} \right)\xrightarrow[{{\left( N{{H}_{4}} \right)}_{2}}{{S}_{2}}{{O}_{8}}]{\text{Benzoyl peroxide or}}X\]
Here, $$X$$ is :
A
\[RMMA\]
B
\[PVC\]
C
\[PAN\]
D
\[\text{None of these}\]
Answer :
\[\text{None of these}\]
78. Teflon and neoprene are the examples of
A
copolymers
B
monomers
C
homopolymers
D
condensation polymers
Answer :
homopolymers
79. Terylene is a condensation polymer of ethylene glycol and
A
benzoic acid
B
phthalic acid
C
terephthalic acid
D
salicylic acid
Answer :
terephthalic acid
80.
Match the polymers given in column I with monomers in column II and mark the appropriate choice.
A
A - iv, B - ii, C - i, D - iii
B
A - i, B - iii, C - iv, D - ii
C
A - iv, B - i, C - ii, D - iii
D
A - ii, B - iv, C - iii, D - i
Answer :
A - iv, B - i, C - ii, D - iii