Free Chemical Process Principles MCQs with Answers

• A. None of these
• B. Condensation polymerisation product
• C. Thermosetting material
• D. Addition polymerisation product

Explanation: Polythene, or polyethylene, forms by addition polymerisation of ethene, with no small molecule eliminated.

• A. Its softening
• B. A treatment to retard its deterioration due to oxidation
• C. Improving its curing rate
• D. Depression of its freezing point

Explanation: Mastication is the mechanical working of raw rubber to break down its long chains and reduce viscosity, making it softer and easier to…

• A. Elastomers
• B. Thermosetting polymers
• C. Thermoplastics
• D. Fibres

Explanation: Thermosetting polymers develop a highly cross-linked three-dimensional network, giving the strongest interparticle or intermolecular…

• A. Ammonium alum
• B. Potassium alum
• C. Both A. & B.
• D. Neither A. nor B.

Explanation: Alum salts destabilise the rubber colloid by neutralising charges and promoting coagulation, so both ammonium alum and potassium alum can…

• A. Harder
• B. More abrasion resistant
• C. Having higher melting point
• D. None of these

Explanation: Nylon-66 generally has the higher melting point and slightly greater hardness and abrasion resistance than nylon-6, so none of the listed…

• A. All A., B. and C.
• B. Stronger
• C. Lighter
• D. Harder

Explanation: Polypropylene has a methyl group on every alternate carbon, giving it greater stiffness and strength than polyethylene, while its lower…

• A. Produces low density polythene
• B. Uses no catalyst
• C. Produces high density polythene
• D. Employs very high pressure

Explanation: The Ziegler process uses a coordination catalyst at relatively low pressure to produce high-density polyethylene with a more linear…

• A. Chloroethane
• B. None of these
• C. Isoprene
• D. Chloroprene

Explanation: Neoprene is formed by polymerising chloroprene, chemically 2-chloro-1,3-butadiene.

• A. Polyacrylonitrile
• B. A natural polymeric fibre
• C. An amorphous polymer
• D. Poly-methyl-methacrylate (PMMA)

Explanation: Orlon is the trade name for polyacrylonitrile, a synthetic fibre with properties resembling wool.

• A. Phenol formaldehyde
• B. An inorganic polymer
• C. Polytetrafluroethylene (PTFE)
• D. A monomer

Explanation: Teflon is polytetrafluoroethylene, or PTFE, formed from tetrafluoroethylene monomers.

• A. As a plasticiser for unsaturated polyester
• B. None of these
• C. As an anti-skimming agent in paint
• D. In the manufacture of synthetic rubber

Explanation: Butadiene contains a conjugated diene system that readily polymerises to produce synthetic rubbers such as polybutadiene and Buna-type…

• A. PVC
• B. Polythene
• C. Rayon
• D. Polyvinyl acetate

Explanation: PVC can be spun from a solution in a volatile solvent, with warm air evaporating the solvent in dry spinning.

• A. Cellulose nitrate
• B. Cellulose acetate
• C. PVC
• D. High density polythene

Explanation: Cellulose acetate is a tough, mouldable thermoplastic that was historically used for automobile steering wheels and similar components.

• A. Cellulose acetate
• B. Regenerated cellulose
• C. Cellulose nitrate
• D. Cellulose acetate butyrate

Explanation: Celluloid is the traditional plastic made by plasticising cellulose nitrate, commonly with camphor.

• A. As room temperature adhesive
• B. As grease & lubricant
• C. Hydraulic fluid for heat transfer
• D. Resin for lamination

Explanation: Silicone resins have good heat resistance and water repellency, so they are used in lubricants, hydraulic or heat-transfer fluids, and…

• A. Polyester
• B. Polystyrene
• C. High density polythene
• D. Polyurethane

Explanation: Polystyrene is a lightweight thermoplastic used for electrical and transistor components, as well as insulation and molded parts in…

• A. Nylon-66
• B. Polyisoprene
• C. Polystyrene
• D. Bakelite

Explanation: Polyisoprene is a nonpolar elastomer with relatively weak dispersion forces between chains.

• A. Polyamide & an elastomer
• B. Good adhesive
• C. Both B. and C.
• D. Surface coating agent

Explanation: Epoxy resins contain epoxide groups and are valued for strong adhesion and resistance to chemicals and moisture.

• A. Teflon
• B. Perspex
• C. Bakelite
• D. Silicones

Explanation: Silicones have an inorganic silicon-oxygen backbone, although organic groups are attached to the silicon atoms.

• A. Bottles
• B. Coating material
• C. Adhesives
• D. Mattresses & foam

Explanation: Polyurethane is widely used for flexible and rigid foams, coatings, and adhesives.