This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Ethenic Polymers”.
1. What is an ethenic polymer?
a) Polymers made from monomers having bifunctional group
b) Polymers made from multiple monomers
c) Polymers made from monomers having trifunctional group
d) Simple polymers
View Answer
Explanation: Polymers made from monomers having the bifunctional group are ethenic because ethylene has the simplest all hydrogen atom structure and others are substitutions of other groups at w, x, y and z positions.
2. How is polyethylene manufactured?
a) Low pressure metal oxide process
b) Low pressure Ziegler process
c) High pressure metal oxide process
d) High pressure Ziegler process
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Explanation: High purity polyethylene is manufactured by desulphuring and removing the light ends followed buy removal of excess oxygen combined with titanium tetrachloride to produce a saturated paraffin.
3. How is the residual catalyst removed during the manufacture of polyethylene?
a) By adding water
b) By adding sulfuric acid
c) By adding nitric acid
d) By adding phosphoric acid
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Explanation: The residual catalyst is removed from the polyethylene by adding water. Water is added because the residual catalyst is highly flammable in dry conditions. Adding acid would increase the flammability.
4. What is the softening point range of PVC?
a) 150-200 °C
b) 20-100 °C
c) 80-140 °C
d) 140-200 °C
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Explanation: PVC has a softening point ranging from 80 °C-140 °C increasing with the degree of after chlorination. After 140°C it decomposes liberating HCl.
5. Which polymerization technique is used for the manufacture of industrial PVC?
a) Solution polymerization
b) Bulk polymerization
c) Emulsion polymerization
d) Addition polymerization
View Answer
Explanation: Emulsion polymerization technique is done in order to produce high purity polymer. In Emulsion polymerization, a typical formulation is 100 parts of water, 100 parts of vinyl monomer, 1 part of persulfate catalyst and 1.5 parts of detergent emulsifier.
6. Which among the following is not an ABS resin?
a) Acrylonitrile
b) Butadiene
c) Styrene copolymer
d) Polypropylene
View Answer
Explanation: Acrylonitrile, butadiene and styrene copolymer are examples of ABS resins. They are classified as engineering plastic used in automobile components, refrigerator parts etc.
Sanfoundry Global Education & Learning Series – Chemical Industry.
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