Free Chemical Process Principles MCQs with Answers

• A. Detergent
• B. Rubber
• C. Pesticide
• D. Polyester

Explanation: Alkylbenzene sulfonates contain a hydrophobic alkylbenzene group and a hydrophilic sulfonate group, allowing them to remove oily dirt in…

• A. SiO2 & Al2O3
• B. CaO & SiO2
• C. CaO & Al2O3
• D. CaO & Fe2O3

Explanation: Portland cement is dominated by calcium silicates, so its principal oxide constituents are calcium oxide and silicon dioxide.

• A. Polystyrene
• B. Polybutadiene
• C. Polyisoprene
• D. Polychlorophrene

Explanation: Natural rubber is principally cis-1,4-polyisoprene, formed by polymerization of isoprene units.

• A. Ammonia
• B. Limestone
• C. None of these
• D. Nitric acid

Explanation: The Solvay process uses brine, limestone and recycled ammonia to produce sodium carbonate.

• A. Chlorine
• B. Common salt
• C. Glauber's salt
• D. Graphite electrode

Explanation: Deacon's process oxidizes hydrogen chloride with air over a catalyst to recover chlorine. The overall reaction is 4HCl + O₂ → 2Cl₂ + 2H₂O.

• A. Thinner
• B. Both A. & B.
• C. Pigment
• D. Neither A. nor B.

Explanation: Varnish is a clear solution of resin in a solvent or thinner, so it does not contain pigment.

• A. From waste sulphite substrate of paper mills
• B. By Esterification and hydrolysis of ethylene
• C. From molasses
• D. None of these

Explanation: Ethyl alcohol can be obtained from sulphite waste liquor, molasses by fermentation, and ethylene through acid-catalysed hydration, often…

• A. Is a good adhesive
• B. Is an elastomer
• C. Cannot be used for surface coatings
• D. Is a polyester

Explanation: Epoxy resins contain reactive epoxide groups that form strong, cross-linked bonds with hardeners, giving excellent adhesion.

• A. Improve its resistance to rancid oxidation
• B. None of these
• C. Remove double bonds
• D. Raise its melting point

Explanation: Hydrogenation consumes carbon-carbon double bonds, which generally raises the melting point and improves resistance to oxidative…

• A. Sand
• B. Quicklime
• C. Bauxite
• D. Calcite

Explanation: High-alumina cement is made by fusing limestone with bauxite, which supplies the high alumina content.

• A. Flint
• B. Pyrex
• C. All A, B. & C
• D. Quartz

Explanation: Quartz glass is essentially pure silica, so it contains no basic oxide such as sodium, calcium, or lead oxide.

• A. Corrosion control
• B. Disinfection and control of taste & odour
• C. Removing turbidity
• D. Control of bacteria

Explanation: Chloramines are relatively stable disinfectants that continue working in distribution systems and reduce taste and odour problems compared…

• A. Ethyl benzene
• B. Ethanol
• C. Ethylene oxide
• D. Ethane

Explanation: Ethanolamines are formed by reacting ammonia with ethylene oxide, which adds the hydroxyethyl group to ammonia.

• A. Density difference
• B. None of these
• C. Terminal velocities
• D. Wetting characteristics

Explanation: Froth flotation separates particles according to their different surface wettabilities: hydrophobic particles attach to air bubbles and…

• A. Teflon
• B. Neoprene
• C. Bakelite
• D. Nylon-66

Explanation: PTFE is the fluoropolymer sold commercially under the name Teflon. Bakelite, neoprene, and nylon-66 are different polymers with different…

• A. Passing it through a bed of diatomaceous earth
• B. Spraying 66° Be H2SO4 counter current to the flow of the gas
• C. Passing it through a bed of silica gel
• D. None of these

Explanation: Wet chlorine is dried by counter-current contact with concentrated sulfuric acid, commonly about 66° Baumé, which absorbs water without…

• A. Glass manufacture
• B. Water treatment
• C. Hydrogenation of fatty oil as a catalyst
• D. Development of exposed photographic plate

Explanation: Zeolite softens water by exchanging sodium ions for calcium and magnesium ions, thereby removing hardness.

• A. SO2 gas
• B. MgO
• C. Chlorine dioxide (ClO2)
• D. Mercaptans

Explanation: Chlorine dioxide is commonly used in the final bleaching stage because it removes the remaining colour-forming lignin residues while…

• A. V2O5
• B. Cr
• C. Ni
• D. Al2O3

Explanation: Phthalic anhydride is produced by catalytic oxidation of naphthalene or o-xylene using vanadium pentoxide, V2O5, generally supported on a…

• A. CaCO3
• B. ZnO
• C. Al2O3
• D. Fe

Explanation: Zinc oxide is used as a catalyst in some fat-splitting processes, where triglycerides are hydrolysed into fatty acids and glycerol.