This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Polycondensation”.
1. Which polymer is considered cheap effective and has excellent physical and electrical properties?
a) Phenolics
b) Epoxy resin
c) Polystyrene
d) PVC
View Answer
Explanation: Phenolics are low cost polymers with excellent physical and electrical properties and fast curing characteristics. Pigments are added to enhance its colour.
2. How can we control the resin characteristics?
a) Basic solution catalyst
b) Acid solution catalyst
c) Solid catalyst
d) Adding acid
View Answer
Explanation: General resin characteristics can be controlled by adding an acid solution catalyst with excess phenol which produces linear soluble thermoplastics.
3. What is epoxidation?
a) Addition of nitrogen atom across a C=C
b) Addition of sulphur atom across a C=C
c) Addition of oxygen atom across a C=C
d) Addition of oxygen atom across a C-C
View Answer
Explanation: Epoxidation is the addition of oxygen across a C=C to give
The oxygen transfer agent can be peracids such as peracetic acid, hydrogen peroxide, or chlorohydrin followed by HCl removal.
4. How is epichlorohydrin condensed with other hydroxyl groups?
a) Resorcinol
b) Alcohol
c) Phenolphthalein
d) PVC
View Answer
Explanation: Epichlorohydrin’s are condensed with other hydroxyl groups in compounds such as resorcinol, hydroquinone, ethylene glycol and glycerol.
5. Epichlorohydrin reins exhibit extreme versatility.
a) True
b) False
View Answer
Explanation: Epoxy reins exhibit extreme volatility because of possible combinations of properties such as chemical stability, reactivity, excellent adhesion, good abrasion and electrical properties.
6. Epoxy polymers are manufactured by batch processing technique.
a) True
b) False
View Answer
Explanation: Epoxy polymers are manufactured largely by batch processing because of low tonnage,
Multiple formulation marketing.
7. What is the main raw material in the manufacture of polyurethane?
a) Polyol
b) Glycol
c) Glycerol
d) Glycerine
View Answer
Explanation: Polyols are used as main raw material in the manufacture of polyurethane foams along with methyl di-phenyl diisocyanate and toluene diisocyanate.
Sanfoundry Global Education & Learning Series – Chemical Industry.
To practice all areas of Chemical Industry, here is complete set of 1000+ Multiple Choice Questions and Answers.
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