Industrial Chemistry

7 free MDCAT Chemistry MCQs on Industrial Chemistry (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

Tap an answer to check it · 7 questions

1. Question 1

   In an addition polymer, the empirical formula is:
   • ASame as the monomer
   • BTwice the monomer
   • CLess one water molecule
   • DUnrelated to monomer
   Show answer and explanation

   Answer: A) Same as the monomer

   Monomers simply add on, so the molecular weight is a multiple of the monomer's. Source: Chemistry 12 KPK (taleem360.com), p. 379.

2. Question 2

   Condensation polymerization is accompanied by the elimination of:
   • AMonomer units without loss
   • BSmall molecules such as water
   • CHeavy metal ions from catalyst
   • DOxygen gas from the air
   Show answer and explanation

   Answer: B) Small molecules such as water

   e.g. H2O, HCl, NH3 or CH3OH. Source: Chemistry 12 KPK (taleem360.com), p. 380.

3. Question 3

   PVC is produced by the polymerization of:
   • AStyrene
   • BEthylene
   • CVinyl chloride
   • DAcetylene
   Show answer and explanation

   Answer: C) Vinyl chloride

   Vinyl chloride is made by adding HCl to acetylene. Source: Chemistry 12 KPK (taleem360.com), p. 379.

4. Question 4

   Indigo belongs to the class of dyes that are water-insoluble but become soluble with powerful reducing agents. These are:
   • ADisperse dyes
   • BAzo dyes
   • CDirect dyes
   • DVat dyes
   Show answer and explanation

   Answer: D) Vat dyes

   Named after the wooden vats once used for the reduction; used on cotton shirts. Source: Chemistry 12 KPK (taleem360.com), p. 372.

5. Question 5

   Dyes that colour cotton without the addition of a mordant are:
   • ADirect dyes
   • BMordant dyes
   • CVat dyes
   • DSulphur dyes
   Show answer and explanation

   Answer: A) Direct dyes

   Their solubility in the dye bath is often reduced by adding salt. Source: Chemistry 12 KPK (taleem360.com), p. 370.

6. Question 6

   Contact adhesives such as neoprene must be:
   • AMelted before use
   • BApplied to both surfaces
   • CCured with UV light
   • DMixed with a hardener
   Show answer and explanation

   Answer: B) Applied to both surfaces

   They dry for a while, then bond very quickly when pressed together. Source: Chemistry 12 KPK (taleem360.com), p. 388.

7. Question 7

   Multipart reactive adhesives, such as epoxies and urethanes, harden by:
   • ACooling a molten solid
   • BSimple solvent evaporation
   • CMixing components that react
   • DLight pressure alone
   Show answer and explanation

   Answer: C) Mixing components that react

   The components cross-link only after mixing and curing. Source: Chemistry 12 KPK (taleem360.com), p. 388.

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