Free Chemical Process Principles MCQs with Answers

• A. Anti soil redeposition agent
• B. Builder
• C. Optical brightening agent
• D. Surfactant

Explanation: CMC forms a protective film on fabric and prevents loosened dirt from settling back onto it during washing.

• A. Not a fumigant
• B. BHC (Benzene Hexachloride) containing 99% γ-isomer
• C. A by-product of BHC manufacture
• D. Both B. and C.

Explanation: Lindane is the nearly pure gamma isomer of BHC, usually containing about 99% gamma-HCH.

• A. 2
• B. 10
• C. 25
• D. 50

Explanation: Sea water contains roughly 35 g/L of total dissolved salts, with sodium chloride accounting for about 25 to 28 g/L.

• A. 200-300
• B. 700-850
• C. 4000-4500
• D. 2000-2200

Explanation: Calcium carbide is produced by reducing lime with coke in an electric furnace at about 2000 to 2200°C.

• A. Less susceptible to chemical attack by molten fluxes and gases etc
• B. Very strong
• C. Having very high thermal conductivity
• D. None of these

Explanation: Highly porous refractory bricks have low density and low thermal conductivity, but their pores reduce mechanical strength and allow easier…

• A. Chemical oxidation processes
• B. Cutting and welding of metals
• C. Medicinal purposes
• D. L.D. steel making

Explanation: Low-purity oxygen is economical where oxygen is consumed in bulk, especially in chemical oxidation processes.

• A. Hydrazine
• B. H2SO4
• C. NaOH
• D. Alum solution

Explanation: Anion-exchange resins exchange negative ions and are regenerated with hydroxide ions supplied by NaOH.

• A. Na2CO3
• B. NaHCO3
• C. None of these
• D. H2

Explanation: Electrolysis of brine produces chlorine at the anode, sodium hydroxide in solution, and hydrogen at the cathode.

• A. 20 - 30
• B. < - 5
• C. 100 - 150
• D. 250 - 300

Explanation: Yeast converts molasses sugars to ethanol most effectively at approximately 20 to 30°C.

• A. Drying
• B. Non-drying
• C. Semi-drying
• D. None of these

Explanation: Oils rich in saturated fatty acids have little tendency to react with oxygen and form films, so they are classified as non-drying oils.

• A. Chloramine
• B. Chlorine
• C. Ferrous sulphate
• D. Hydrogen peroxide

Explanation: Ferrous sulphate can destabilise suspended particles and is therefore used as a coagulant in water treatment.

• A. V2O5 & Cr2O3.
• B. Oxides of nitrogen & Cr2O3
• C. V2O5 on a porous carrier & oxides of nitrogen
• D. Oxides of nitrogen & V2O5 on a porous carrier

Explanation: The chamber process uses oxides of nitrogen to promote oxidation of sulphur dioxide, whereas the contact process uses vanadium pentoxide…

• A. Cumene
• B. Neoprene
• C. Gelatin
• D. Mercaptans

Explanation: Alkylation of benzene with propylene introduces an isopropyl group, producing isopropylbenzene, whose common name is cumene.

• A. Tetrachloroethane
• B. Tetrachloromethane
• C. Trichloroethane
• D. Trichloromethane

Explanation: DDT stands for dichlorodiphenyltrichloroethane. The word trichloroethane identifies the three chlorine atoms and the ethane portion of the…

• A. Lead
• B. None of these
• C. Carbon disulphide
• D. Cement

Explanation: Calcareous materials supply calcium carbonate, while argillaceous materials supply silica and alumina; these are the principal…

• A. 4 kgf/cm2 & 500°C
• B. 10 kgf/cm2 & 1000°C
• C. 40 kg/cm2 & 200°C
• D. 100 kgf/cm2 & 500°C

Explanation: Ethylene dichloride is cracked at about 500°C to form vinyl chloride and hydrogen chloride; the listed low pressure is the closest…

• A. More unsaturated glycerides of fatty acids
• B. Less unsaturated glycerides of fatty acids
• C. Much higher reactivity to oxygen
• D. Lower melting point

Explanation: Fats contain a higher proportion of saturated glycerides, so they are generally solid and have higher melting points than oils.

• A. Always contain some amount of nickel (as their complete removal is very difficult)
• B. Are prone to rancid oxidation
• C. Cause cholesterol build up and blood clotting
• D. Have affinity to retain harmful sulphur compounds

Explanation: Fully hydrogenated oils are highly saturated and can contribute to raised blood cholesterol, so partial hydrogenation was traditionally…

• A. Styrene
• B. Phenol
• C. None of these
• D. Phthalic anhydride

Explanation: Vapour-phase catalytic oxidation of naphthalene produces phthalic anhydride, an important intermediate for plasticizers and resins.

• A. Cyclo trimethylene trinitramine
• B. Trinitro resorcinol
• C. Cyclo tetramethylene tetranitramine
• D. Trinitrobenzene

Explanation: RDX is cyclotrimethylene trinitramine, a cyclic nitramine explosive. Cyclotetramethylene tetranitramine is HMX, a different explosive…