Free Chemical Process Principles MCQs with Answers

• A. Nicotine
• B. Caffeine
• C. Calgon
• D. Lignin

Explanation: Caffeine is a naturally occurring alkaloid and a characteristic stimulant component of coffee.

• A. Better heat & acid resistant properties
• B. Poorer resistance to alkalis
• C. All A , B. and C.
• D. Poorer dyeability

Explanation: Dacron is polyester, giving it better heat and acid resistance than nylon, but it is more vulnerable to alkalis and is harder to dye.

• A. 50
• B. 100
• C. 200
• D. 300

Explanation: Vegetable oils generally have high flash points because they are low-volatility triglycerides; a typical value is close to 200°C.

• A. Bleaching powder
• B. Alum
• C. Slaked lime
• D. Copper sulphate

Explanation: Alum hydrolyses in water to form gelatinous aluminium hydroxide, which traps and settles suspended particles during coagulation.

• A. Sulphate
• B. Hydroxide
• C. Carbonate
• D. Bi-carbonate

Explanation: In the Kraft process, black liquor contains spent inorganic cooking chemicals and dissolved organic matter, with sodium carbonate as a…

• A. Reduction
• B. Decomposition
• C. Oxidation
• D. Hydration

Explanation: Cement hardens under water because its silicate and aluminate compounds react with water to form hydrated compounds and calcium hydroxide.

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

Explanation: Hydrogenation adds hydrogen across the unsaturated double bonds of vegetable-oil fatty acids and releases heat.

• A. Linde's
• B. Either A. or B.
• C. Claude's
• D. None of these

Explanation: Both the Linde and Claude processes liquefy air and then use fractional distillation to separate oxygen from nitrogen and other…

• A. Toluene
• B. Phenol
• C. Propylene
• D. Naphthalene

Explanation: Synthetic glycerine is manufactured from propylene through intermediates such as allyl chloride and epichlorohydrin, followed by…

• A. Fibrillation of fibre
• B. Cutting of fibres
• C. Hydration of fibres
• D. Final rolling out of paper

Explanation: A Hollander beater cuts, hydrates and fibrillates pulp fibres to prepare the stock.

• A. Propyl alcohol
• B. Acetone
• C. Trichloroethylene
• D. Formaldehyde

Explanation: Dehydrogenation removes hydrogen from isopropanol and forms the ketone acetone: (CH3)2CHOH → (CH3)2CO + H2.

• A. Dehydrogenation of ethyl benzene
• B. Oxidation of benzene
• C. Oxidation of naphthalene
• D. None of these

Explanation: Phthalic anhydride is classically produced by catalytic oxidation of naphthalene, although modern plants may also use o-xylene.

• A. Na2CO3
• B. Na2CO3.H2O
• C. Na2CO3.10H2O
• D. NaHCO3

Explanation: Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O. Anhydrous Na2CO3 is soda ash, while NaHCO3 is baking soda.

• A. None of these
• B. More than
• C. Same
• D. Less than

Explanation: Toilet soap is intended for skin contact, so it is more carefully washed and neutralised and contains less free alkali.

• A. Both A. and B.
• B. Used for setting of broken bones
• C. CaSO4.½H2O
• D. Same as gypsum

Explanation: Plaster of Paris is calcium sulfate hemihydrate, CaSO4·½H2O, which reacts with water to form gypsum and harden.

• A. Ferrous sulphate
• B. Copper sulphate
• C. Copper nitrate
• D. Aluminium sulphate

Explanation: Blue vitriol is the common name for hydrated copper(II) sulphate, usually written CuSO₄·5H₂O, whose blue crystals give it the name.

• A. Paper
• B. Steel
• C. Fertiliser
• D. Paint

Explanation: Sulphuric acid is used mainly to manufacture phosphate fertilisers such as superphosphate and ammonium sulphate.

• A. Alkyl benzene sulphonate (ABS)
• B. Fatty alcohol
• C. Fatty acids
• D. Methylene chloride

Explanation: Alkyl benzene sulphonate is an anionic synthetic detergent because its sulphonate group provides water solubility while its hydrocarbon…

• A. A slow reaction
• B. All A , B. and C
• C. Still in development stage (by employing fluidised bed technique)
• D. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)

Explanation: The iron-steam process is unsuitable for continuous commercial hydrogen production because the iron must be regenerated, making the…

• A. Adhesive
• B. Type of glass
• C. Abrasive
• D. Brittle material

Explanation: Silicon carbide is extremely hard and maintains its strength at high temperature, making it a widely used abrasive and refractory…