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Interview
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Chemical Process Questions
Industrial gases — applications of neon Considering common industrial and lighting applications, which of the following statements about neon gas is correct?
Coal gasification — key advantage of the Lurgi gasifier Which of the following describes a major advantage of the Lurgi fixed-bed (dry-ash) coal gasifier in industrial service?
Biochemistry fundamentals — composition of enzymes From a biochemical standpoint, all classical enzymes are composed of which macromolecule class as their primary structural material?
Industrial gas mixtures — composition of producer gas Producer gas made by blowing air (and sometimes steam) over hot coke or coal contains primarily which components?
Pulp and paper — sulfate (kraft) pulping conditions In the sulphate (kraft) process, the cooking conditions in the digester are typically closest to which pressure–temperature combination?
Soap technology — role of sulphur in medicated soaps In specialty “sulphur soaps,” the intentional addition of sulphur serves primarily which purpose for consumers?
Chlor-alkali (mercury cell) operation: Approximately what concentration (%) of NaOH solution is produced directly from a mercury electrolytic cell before any evaporation or dilution?
Water quality and hardness: Which statement best describes hard water in terms of lathering, potability, and environmental impact?
Sulfuric acid manufacture: Regarding the historical lead chamber process, which statement is correct about its capability and mode of operation compared with the contact process?
Polymer trade names and chemistry: “Neoprene” is the commercial/trade name for which polymer?
Epoxy systems in materials engineering: Which statement best describes a key property or application of epoxy resins?
Industrial applications of hydrochloric acid (HCl): What is the principal combined industrial use of HCl among the following options?
Combustion handling of pitch from coal tar: Why is pitch always mixed with creosote oil before burning in a pressure-atomized burner or transferring through pipelines?
Ironmaking chemistry: In a modern blast furnace, which species acts as the principal reducing agent for converting iron oxides to metallic iron?
Ethylbenzene to styrene: By which fundamental reaction step is styrene industrially produced from ethylbenzene?
Process selection and sustainability: For producing caustic soda via the mercury electrolytic cell, what is the single most adverse factor challenging the continued use of this process?
In the pulp and paper industry, kraft (sulphate) pulping is known for its characteristic product properties. Which description best captures the typical qualities of paper pulp produced by the kraft/sulphate process?
In industrial mineral extraction, the Frasch process is a classic method used for which operation?
Textile polymers: Viscose rayon is chemically best described as which of the following materials?
Coal gasification chemistry: For the reaction C + H2O → CO + H2 (steam–carbon reaction), classify the thermal nature of this gasification step.
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