Free Chemical Process Principles MCQs with Answers

• A. As a starting material for 'hypo'
• B. As rocket fuel
• C. In photographic industry
• D. In printing industry

Explanation: Hydrazine is a powerful reducing fuel with a high energy release and is used in rocket and spacecraft propulsion systems.

• A. 500°C
• B. 750°C
• C. 1000°C
• D. 1500°C

Explanation: Limestone calcination requires roughly 900 to 1100°C, with about 1000°C being the standard value used for the calcination zone.

• A. Ethyl alcohol
• B. Methyl alcohol
• C. Benzol
• D. Dimethyl ether

Explanation: Molasses contains fermentable sugars, which yeast converts mainly into ethanol and carbon dioxide.

• A. NH4Cl
• B. CaCl2
• C. NH3
• D. NaOH

Explanation: In the Solvay process, calcium carbonate is converted to calcium oxide, which reacts with ammonium chloride to regenerate ammonia and form…

• A. V2O5
• B. Ni
• C. ZnO
• D. FeO

Explanation: Zinc oxide catalyses the hydrolysis or splitting of fats into glycerol and fatty acids.

• A. Nitrobenzene
• B. Benzene
• C. Nitrotoluene
• D. Toluene

Explanation: TNT is produced by successive nitration of toluene, introducing three nitro groups onto its aromatic ring.

• A. All A , B. and C.
• B. Fuel in rotary kiln
• C. Binder in making carbon electrodes
• D. Binding material for coal briquettes

Explanation: Coal tar has several industrial uses: it can bind coal briquettes, serve as fuel, and act as a binder in carbon-electrode manufacture.

• A. Both temperature & pressure in the former is less than that
• B. Both temperature & pressure in the former is more than that
• C. Temperature is more in the former whereas pressure is more
• D. Pressure is more in the former whereas temperature is less

Explanation: The sulphate or kraft process generally uses harsher digestion conditions than the sulphite process, including higher operating…

• A. Cellulosic photographic material
• B. Zinc oxide
• C. Zinc sulphide
• D. Lead oxide

Explanation: Litharge is the yellow or reddish-yellow form of lead(II) oxide, PbO. Zinc oxide is called zincite, not litharge.

• A. Storage under improper conditions
• B. Absence of unsaturation
• C. Its smaller molecular weight
• D. None of these

Explanation: A high acid value means that more free fatty acids have formed through hydrolysis of the oil or fat, commonly because of moisture, heat…

• A. Manufacture of explosive
• B. None of these
• C. Manufacture of pharmaceuticals
• D. Conditioning and humidification of tobacco

Explanation: Glycerine is used in explosives such as nitroglycerine, as a humectant in tobacco, and in pharmaceutical preparations.

• A. Plastic
• B. Monoclinic
• C. Rhombic
• D. Flowers of sulphur

Explanation: Rhombic sulphur is the stable allotrope below about 96°C, including room temperature.

• A. Fertiliser manufacture
• B. Water treatment
• C. Synthesis of oleum
• D. Car battery solution

Explanation: Dilute sulphuric acid with a specific gravity around 1.20 is associated with lead-acid battery electrolyte.

• A. Sand, lime and soda ash
• B. Lime, clay and soda ash
• C. Silica, alumina and clay
• D. Silica, alumina and soda ash

Explanation: Ordinary soda-lime glass is made mainly from silica-rich sand, with soda ash lowering the melting temperature and lime improving chemical…

• A. Starting material for the synthesis of glycerine
• B. Plasticiser for unsaturated polyester
• C. Detergent
• D. Coating ingredient for photographic film

Explanation: Aryl alkyl benzene sulphonates are surface-active compounds that lower water's surface tension and help remove oily dirt.

• A. Calcium carbonate
• B. Calcium oxide
• C. Calcium sulphate
• D. Tricalcium silicate

Explanation: Tricalcium silicate, C3S, is the principal clinker phase responsible for early strength development in Portland cement.

• A. None of these
• B. Condensation
• C. Thermosetting
• D. Addition

Explanation: Ethene units form polythene by opening the carbon-carbon double bond and linking without eliminating a small molecule, which defines…

• A. Cellulose
• B. Lignin
• C. Both A. & B.
• D. None of these

Explanation: Cellulose provides the fibrous strength-forming material required in paper, whereas lignin is largely removed because it causes yellowing…

• A. Distillation
• B. Hydrogenation of oils
• C. Absorption
• D. Humidification

Explanation: A unit process involves a chemical reaction, whereas distillation, absorption and humidification are unit operations based on physical…

• A. Electrolysis
• B. Electrolytic oxidation
• C. Electrolytic reduction
• D. None of these

Explanation: In the Hall-Héroult process, alumina dissolved in molten cryolite is converted to aluminium by electrolytic reduction at the cathode.