27 real Chemical Technology questions from the Chemical Core bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Haber-Bosch process?
Junior
A.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
B.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
C.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
D.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
2. Which term means: "ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle"?
A.Haber-Bosch process — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
B.Haber-Bosch process — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
C.Haber-Bosch process — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
D.Haber-Bosch process — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
A.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
B.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
D.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
A.Contact process — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
B.Contact process — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
C.Contact process — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
D.Contact process — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
A.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
B.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
C.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
D.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
8. Which term means: "ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled"?
A.Urea synthesis — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
B.Urea synthesis — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
C.Urea synthesis — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
D.Urea synthesis — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
A.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
B.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
C.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
D.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
11. Which term means: "brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells"?
A.Membrane cell chlor-alkali — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
B.Membrane cell chlor-alkali — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
C.Membrane cell chlor-alkali — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
D.Membrane cell chlor-alkali — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
B.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
C.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
D.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
14. Which term means: "pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench"?
A.Steam cracking — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
B.Steam cracking — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
C.Steam cracking — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
D.Steam cracking — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
A.limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
B.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
D.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
17. Which term means: "limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum"?
A.Portland cement clinker — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
B.Portland cement clinker — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
C.Portland cement clinker — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
D.Portland cement clinker — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
B.clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
C.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
D.limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
20. Which term means: "clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation"?
A.Sugar juice sulphitation — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
B.Sugar juice sulphitation — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
C.Sugar juice sulphitation — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
D.Sugar juice sulphitation — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
A.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
B.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
D.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
A.Ziegler-Natta catalyst — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
B.Ziegler-Natta catalyst — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
C.Ziegler-Natta catalyst — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
D.Ziegler-Natta catalyst — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
B.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
C.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
D.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
26. Which term means: "endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen"?
A.Steam methane reforming — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
B.Steam methane reforming — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
C.Steam methane reforming — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
D.Steam methane reforming — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
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