Free Chemical Process Principles MCQs with Answers

• A. CaO
• B. MnO2
• C. ZnO
• D. FeS

Explanation: ZnO modifies the glass network and lowers its coefficient of thermal expansion, improving resistance to thermal shock.

• A. SO3
• B. SO2
• C. H2SO3
• D. H2SO4

Explanation: Oleum is sulfuric acid containing dissolved excess SO3, and its strength is commonly expressed as equivalent H2SO4 percentage.

• A. Bakelite
• B. Pumice
• C. Corundum
• D. Carborundum

Explanation: Pumice, corundum, and carborundum are used as abrasive materials because of their hard, wear-resistant particles.

• A. Multi-effect evaporation only
• B. Evaporation and burning the concentrate followed by causticisation of products
• C. Selective liquid extraction
• D. Extractive distillation

Explanation: In kraft recovery, black liquor is concentrated and burned to form smelt, whose sodium compounds are then causticised to regenerate white…

• A. Dehydrate it
• B. Sinter the ore
• C. Remove arsenic & sulphur
• D. Remove CO2 & H2O

Explanation: Roasting heats an ore in excess air, oxidising sulphides and volatile impurities such as sulphur and arsenic.

• A. Ethyl alcohol
• B. Impurities
• C. Carbonic acid
• D. Methyl alcohol

Explanation: Methyl alcohol, or methanol, is highly toxic and can cause blindness, metabolic acidosis, or death even in relatively small quantities.

• A. Reduction
• B. Roasting
• C. Calcination
• D. Smelting

Explanation: Heating pyrite in air oxidises its sulphur to sulphur dioxide, while the iron remains mainly as an oxide.

• A. 14 - 30 and 40-50
• B. 7-14 and 40-50
• C. 7-14 and 14-30
• D. 10 - 20 and 40 - 50

Explanation: Natural wines commonly contain about 7–14% alcohol, while fortification raises the alcohol content to roughly 14–30%.

• A. Gives an idea about its molecular weight
• B. Is inversely proportional to its molecular weight
• C. Detects its adulteration
• D. All A , B. & C.

Explanation: The saponification number measures the alkali needed to hydrolyse a fixed mass of fat, so it is inversely related to the average molecular…

• A. All A , B. and C.
• B. Low ignition temperature
• C. High electrical resistivity
• D. Low ash content

Explanation: Calcium carbide is produced in an electric furnace, so the coke should contribute little ash, ignite readily, and have high electrical…

• A. Exothermic
• B. Endothermic
• C. Catalytic
• D. Autocatalytic

Explanation: The reaction of carbon with steam to form water gas requires heat, with its enthalpy change being positive.

• A. Glucose and glucose
• B. Glucose and galactose
• C. Glucose and fructose
• D. Fructose and galactose

Explanation: Sucrose is formed from one glucose unit and one fructose unit joined by a glycosidic bond.

• A. Fats
• B. Carbohydrates
• C. Proteins
• D. Amino acids

Explanation: Enzymes are biological catalysts composed mainly of proteins, while amino acids are the smaller units that make up proteins.

• A. Tetra-ethyl lead
• B. Isopropyl alcohol
• C. Zeolite
• D. Cumene

Explanation: Tetraethyl lead is organometallic because it contains a direct lead-carbon bond, joining a metal to organic ethyl groups.

• A. Tannin
• B. Collagen
• C. Molasses
• D. Carbohydrate

Explanation: Gelatine is produced by partial hydrolysis of collagen, the structural protein found in animal connective tissues.

• A. Sulphur
• B. Charcoal
• C. Carbon
• D. Potassium nitrate

Explanation: Traditional gunpowder contains charcoal, sulphur, and potassium nitrate; charcoal supplies the carbonaceous fuel.

• A. Spalling
• B. Neither A. nor B.
• C. Both A. & B.
• D. Refractoriness

Explanation: Refractoriness is the ability of a refractory material to resist softening or fusion at high temperature under a specified load or heating…

• A. Propylene alkylation of benzene
• B. Oxidation of naphthalene
• C. Polymerisation of a mixture of benzene & propylene
• D. None of these

Explanation: Cumene is produced by alkylating benzene with propylene, adding an isopropyl group to the benzene ring.

• A. Hydrolysis
• B. Dehydration
• C. Hydration
• D. Loss of CO2

Explanation: Plaster of Paris, calcium sulfate hemihydrate, sets by reacting with water to form gypsum, calcium sulfate dihydrate.

• A. Anti-pyretic drug
• B. Food preservative
• C. Dye
• D. Flavour

Explanation: Vanillin is the characteristic flavouring compound associated with vanilla and is widely used as a flavouring agent.