A PVC sample has an average molar mass of 125 000 g mol⁻¹. How many monomer units does an average chain contain (C = 12, H = 1, Cl = 35.5)?
Correct answer D. 2000
Topic / 37 questions
Industrial Chemistry MCQs
Industrial Chemistry MCQs are multiple-choice questions on adhesives, dyes and polymers, covering their types, preparation, properties and everyday uses. They follow the MDCAT chemistry curriculum, and every question on MCQs360 shows its correct answer instantly so you can revise definitions, examples and short calculations in one place.
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
A sample of polyethene has an average molar mass of 28 000 g mol⁻¹. What is its average degree of polymerisation (C = 12, H = 1)?
Correct answer A. 1000
Bakelite, a thermosetting plastic, is produced by condensation of ____.
Correct answer B. phenol and methanal
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Polyvinyl chloride (PVC) is obtained by addition polymerisation of ____.
Correct answer B. chloroethene
Nylon-6,6 is made from hexanedioic acid and hexane-1,6-diamine. What type of polymerisation is this?
Correct answer C. Condensation polymerisation
Teflon is an addition polymer of which monomer?
Correct answer B. Tetrafluoroethene
Cyanoacrylate adhesives (superglues) harden mainly by ____.
Correct answer D. rapid polymerisation triggered by moisture
Hot-melt adhesives form a bond when they ____.
Correct answer C. solidify on cooling after being applied molten
In a dye molecule, the group responsible for producing colour is called the ____.
Correct answer B. chromophore
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Azo dyes are characterised by the presence of which group?
Correct answer A. −N=N−
A substance such as alum used to fix a dye firmly onto a fabric is called a ____.
Correct answer D. mordant
Indigo is applied to cotton in its reduced, soluble form and then oxidised in air on the fibre. Indigo is therefore a ____ dye.
Correct answer A. vat
Bakelite, made from phenol and methanal, is used for electrical switches. Which property explains why it does not soften on heating?
Correct answer B. It is a thermosetting polymer with extensive cross-linking
Take C = 12, F = 19. What is the percentage by mass of fluorine in PTFE (Teflon), whose repeat unit is –CF₂–CF₂–?
Correct answer C. 76.0%
In a plant, 2.1 tonnes of propene is fed into a reactor and 90% of it is converted into polypropene. What mass of polypropene is produced?
Correct answer B. 1.89 tonnes
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A sample of nylon-6,6 has an average molar mass of 45 200 g/mol. The repeat unit, C₁₂H₂₂N₂O₂, has a molar mass of 226 g/mol. How many repeat units are in an average chain?
Correct answer C. 200
Take C = 12, H = 1, Cl = 35.5. What is the percentage by mass of chlorine in PVC, whose repeat unit is –CH₂–CHCl–?
Correct answer D. 56.8%
Take ethene, C₂H₄ = 28 g/mol. A sample of polyethene has an average molar mass of 42 000 g/mol. What is its average degree of polymerisation?
Correct answer A. 1500
Why can a thermoplastic such as polyethene be melted and remoulded many times?
Correct answer B. Its chains are held by weak intermolecular forces with no cross-links
Terylene (PET) is a polyester made from which pair of monomers?
Correct answer A. Ethane-1,2-diol and benzene-1,4-dicarboxylic acid
About Industrial Chemistry MCQs
Polymer questions compare addition and condensation polymerisation and ask about the monomers, structures and uses of polymers such as polyethene, PVC, PTFE (Teflon), nylon-6,6, Terylene and Bakelite. You will also distinguish thermoplastics from thermosetting plastics and calculate the percentage of an element in a repeat unit. Dye questions cover the classes of dyes, such as direct, mordant, vat and disperse dyes, and which fibres each suits, including the application of indigo as a vat dye. Adhesive questions compare natural adhesives such as starch and animal glue with synthetic ones such as epoxy resins and explain how two-part adhesives cure.
Key facts to remember
- Addition polymers form from unsaturated monomers with no loss of atoms; condensation polymers form with the loss of small molecules such as water.
- Terylene (PET) is a polyester made from ethane-1,2-diol and benzene-1,4-dicarboxylic acid (terephthalic acid).
- Thermosetting plastics such as Bakelite have a cross-linked structure, so they do not soften on heating; thermoplastics such as polyethene and PVC do.
- Direct dyes can be applied to cotton from an aqueous bath without a mordant, while disperse dyes are used for polyester fibres.
- Vat dyes such as indigo are applied in a reduced, soluble form and then oxidised in air back to the insoluble coloured dye inside the fibre.
- Two-part epoxy adhesives harden when the resin and hardener are mixed and react to form a cross-linked polymer.
Exams that include Industrial Chemistry MCQs
Pakistan
- MDCAT
- ECAT
- NUMS
- AKU
- FSc boards
Bangladesh
- HSC
- Medical Admission Test
How to prepare for Industrial Chemistry MCQs
- Make a polymer table with monomer, type of polymerisation, structure and one use for each example.
- Group dyes by method of application and the fibre each is used on.
- Link the properties of thermosetting plastics and epoxy adhesives to cross-linking.
- Practise percentage composition questions using the repeat unit of the polymer.
Frequently asked questions
What does the MDCAT syllabus include in Industrial Chemistry?
The PMDC MDCAT curriculum for Industrial Chemistry covers adhesives and their types and applications, dyes and their types and uses, and polymers, including addition and condensation polymers and their sub-types.
Which exams ask Industrial Chemistry MCQs?
Industrial chemistry questions on polymers, dyes and adhesives appear in MDCAT, ECAT, NUMS and AKU entry tests and FSc board papers in Pakistan. In Bangladesh, polymer chemistry is studied in HSC and supports medical admission test preparation.
What is the difference between addition and condensation polymers?
Addition polymers, such as polyethene and PVC, form when unsaturated monomers join without losing any atoms. Condensation polymers, such as nylon-6,6 and Terylene, form when monomers with two functional groups join and release a small molecule, usually water, at each link.
Last reviewed October 2026