1. Chemicals that are produced in small quantities and with very high degree of purity are…

• Options: A. bulk chemicals. B. fine chemicals. C. heavy chemicals. D. light chemicals.

• Correct Option: B. fine chemicals

• Explanation: This is the standard definition. Heavy chemicals (or bulk chemicals) are produced in huge quantities often with lower purity (e.g., Sulfuric acid). Fine chemicals are produced in small volumes for specific applications requiring high purity, such as drugs, dyes, and laboratory reagents.

2. Which of the following raw materials is used in the plastic industry?

• Options: A. Calcium. B. Ethene. C. Hydrogen. D. Methane.

• Correct Option: B. Ethene

• Explanation: Ethene (

  C2H4C_2H_4C2​H4​

  ) is a monomer. Through a process called polymerization, many ethene molecules join together to form Polythene (Polyethylene), which is the most common plastic used for bags and packaging.

   

3. Which of the following substances is a heavy chemical?

• Options: A. Ammonia. B. Barium hydroxide. C. Hydrochloride acid. D. Tetraoxosulphate (VI) acid.

• Correct Option: D. Tetraoxosulphate (VI) acid

• Explanation: Tetraoxosulphate (VI) acid (

  H2SO4H_2SO_4H2​SO4​

  ) is the most widely produced chemical in the world. It is the “workhorse” of the chemical industry, used to make fertilizers, detergents, and car batteries. Because of the massive scale of its production, it is the ultimate heavy chemical.

   

4. Which of the following substances cannot be classified as a heavy chemical?

• Options: A.

  AgNO3AgNO_3AgNO3​

  . B. CaO. C.

  CaOCl2CaOCl_2CaOCl2​

  . D.

  H2SO4H_2SO_4H2​SO4​

  .

   

• Correct Option: A.

          AgNO3AgNO_3AgNO3​ 

  (Silver Nitrate)

   

• Explanation: Silver Nitrate is expensive and used in small quantities (mostly in photography or as a laboratory reagent). Therefore, it is a Fine Chemical. CaO (Quicklime),

  CaOCl2CaOCl_2CaOCl2​

  (Bleaching powder), and

  H2SO4H_2SO_4H2​SO4​

  are produced in bulk.

   

5. The production of biogas from the fermentation of waste materials is an example of…

• Options: A. combustion. B. incineration. C. refining. D. recycling.

• Correct Option: D. recycling

• Explanation: Biogas production takes organic waste (sewage, cow dung) and converts it into useful energy (methane). Since you are turning “waste” back into a “resource,” it is a form of biological recycling.

6. Which of the following statements about fine chemicals is correct?

• Options: A. is injurious to health. B. has low degree of purity. C. is produced in relatively small amount. D. can be stored for a long time.

• Correct Option: C. is produced in relatively small amount

• Explanation: As defined in Question 1, fine chemicals are characterized by low volume production and high purity.

7. Which of the following raw materials is used in the plastic industry?

• Options: A. Ethene. B. Methane. C. Sulphur. D. Hydrogen.

• Correct Option: A. Ethene

• Explanation: (Same as Question 2). Ethene is the primary feedstock for polyethylene plastics.

8. Fats and oils can be obtained from any of the following sources except…

• Options: A. paraffin oil. B. animals. C. groundnuts. D. palm kernel.

• Correct Option: A. paraffin oil

• Explanation: Fats and oils are lipids derived from plants (groundnuts, palm kernel) or animals. Paraffin oil is a petroleum product (a mixture of hydrocarbons) obtained from crude oil, not a biological fat.

9. Which of the following materials is classified as a non-biodegradable pollutant?

• Options: A. Animal hide. B. Paper. C. Plastic. D. Wood.

• Correct Option: C. Plastic

• Explanation: Animal hide, paper, and wood are organic and can be broken down by bacteria (biodegradable). Plastics are synthetic polymers that bacteria cannot easily break down, so they persist in the environment for hundreds of years.

10. Which of the following statements about thermoplastic material is correct?

• Options: A. Do not melt on heating. B. Harden on heating. C. Decompose on heating. D. Soften and melt on heating.

• Correct Option: D. Soften and melt on heating

• Explanation: Thermoplastics (like nylon or polythene) have weak forces between their polymer chains. When heated, they soften and can be remolded. (Thermosets, on the other hand, harden and cannot be remelted).

11. The following are heavy chemicals except…

• Options: A. tetraoxosulphate (VI) acid. B. caustic soda. C. sodium trioxocarbonate (IV). D. dyes.

• Correct Option: D. dyes

• Explanation: Dyes are complex organic molecules made in smaller batches with very specific chemical structures. They are Fine Chemicals. Acids (

  H2SO4H_2SO_4H2​SO4​

  ) and alkalis (Caustic soda, Soda ash) are Heavy Chemicals.

   

12. The major raw material in a plastic industry is…

• Options: A. ethanol. B. sulphur. C. methylethanoate. D. ethene.

• Correct Option: D. ethene

• Explanation: Ethene is the most common monomer used to create plastics (polythene).

13. Which of the following compounds is not a raw material for the manufacture of plastics?

• Options: A. Ethyne. B. Ethane. C. Monochloroethene. D. Propene

• Correct Option: B. Ethane

• Explanation: Plastics are usually made by addition polymerization, which requires double or triple bonds (unsaturated hydrocarbons).

  • Ethyne (triple bond)

    $\to$

    Neoprene/PVC precursors.

     

  • Monochloroethene (double bond)

    $\to$

    Polyvinyl Chloride (PVC).

     

  • Propene (double bond)

    $\to$

    Polypropylene.

     

  • Ethane is a saturated alkane (single bonds only) and is not reactive enough to be used directly as a monomer for plastics.

14. Vulcanization of rubber…

• Options: A. stops the growth of fungus on the rubber. B. increases the solubility of the rubber. C. decreases the elasticity of the rubber. D. hardens the rubber through cross-linkage.

• Correct Option: D. hardens the rubber through cross-linkage

• Explanation: Natural rubber is soft and sticky. Vulcanization involves heating rubber with sulphur. The sulphur forms “cross-links” (bridges) between the rubber chains, making the rubber harder, stronger, and more durable.

15. The factors which should be taken into consideration when establishing a paint industry include…

• Options: A. IV only. B. I & III. C. III & IV. D. I, II, III, IV.

• Correct Option: D. I, II, III, IV

• Explanation: Any chemical industry requires:

  • Energy (I) to run machines.

  • Effluent disposal (II) to manage waste safely.

  • Water (III) (paints, especially emulsion paints, use significant water).

  • Pigments (IV) are the raw materials for color.
    Therefore, all factors are relevant.

16. The key factor to be considered in siting a chemical industry is…

• Options: A. favourable climatic conditions. B. the availability of space to store raw materials. C. its nearness to other industrial establishments. D. its nearness to the source of raw materials.

• Correct Option: D. its nearness to the source of raw materials

• Explanation: While all factors matter, economic feasibility is key. Transporting bulky raw materials is very expensive. It is much cheaper to transport the finished product. Therefore, industries are located near raw materials (e.g., Cement factories near limestone deposits).

17. In which of the following processes is biotechnology not applied?

• Options: A. Manufacture of drugs. B. Treatment of domestic sewage. C. Production of alcoholic beverages. D. Electroplating of metals.

• Correct Option: D. Electroplating of metals

• Explanation: Biotechnology involves using living organisms (bacteria, yeast, etc.).

  • Drugs (antibiotics) use fungi/bacteria.

  • Sewage treatment uses bacteria to decompose waste.

  • Alcohol uses yeast (fermentation).

  • Electroplating is a physical/chemical process using electricity to coat metals; no biology is involved.

18. Which of the following establishments uses the process of fermentation in its operation?

• Options: A. Fertilizer plant. B. Textile industry. C. Brewery. D. Soap manufacturing industry.

• Correct Option: C. Brewery

• Explanation: Breweries produce beer and wine. This is done by adding yeast to sugars, a process known as fermentation, to produce ethanol and carbon dioxide.

19. Biotechnology is applied in the following except…

• Options: A. baking industry. B. wine production. C. production of antibiotics. D. manufacture of soap.

• Correct Option: D. manufacture of soap

• Explanation: Soap is made by a chemical reaction called Saponification (heating fats with a strong base). No living organisms are required. Baking and wine use yeast; antibiotics utilize microbes.

20. A plastic which cannot be softened by heat is described as…

• Options: A. thermosetting. B. non-biodegradable. C. thermoplastic. D. malleable.

• Correct Option: A. thermosetting

• Explanation: Thermosetting plastics (like Bakelite) form permanent cross-links during their initial shaping. If you reheat them, they will not soften; they will eventually burn or decompose.

21. Biotechnology is applied in the…

• Options: A. treatment of sewage. B. treatment of water. C. purification of chemicals. D. purification of metals.

• Correct Option: A. treatment of sewage

• Explanation: Modern sewage treatment plants use aerobic and anaerobic bacteria to break down organic waste matter. This is a classic application of environmental biotechnology.

22. Which of the following substances can be classified as heavy chemical?

• Options: A.

  CaOCl2CaOCl_2CaOCl2​

  B.

  H2SO4H_2SO_4H2​SO4​

  C.

  AgNO3AgNO_3AgNO3​

  D.

  $CaO$

  .

   

• Correct Option: B.

          H2SO4H_2SO_4H2​SO4​ 

   

• Explanation: Refer to Question 3. Sulfuric acid (

  H2SO4H_2SO_4H2​SO4​

  ) is the definition of a heavy chemical due to the massive volume produced globally. (

  CaOCl2CaOCl_2CaOCl2​

  and

  $CaO$

  are also bulk chemicals, but

  H2SO4H_2SO_4H2​SO4​

  is the primary answer in this context).

   

23. Which of the following substances is an example of a fine chemical?

• Options: A. Sodium hydroxide B. Hydrochloric acid C. Ethylene D. Ammonia.

• Correct Option: B. Hydrochloric acid (in the context of laboratory reagents)

• Explanation: Note: This question is slightly ambiguous as all listed can be heavy chemicals. However, in the context of school examinations: Sodium Hydroxide, Ethylene, and Ammonia are produced in massive tonnage for industry (Heavy). Hydrochloric acid is frequently produced in smaller, highly purified batches for use as an analytical reagent (AnalaR grade) in laboratories, fitting the description of a Fine Chemical better than the others in this specific list.

24. A factor that is considered most important when siting a chemical industry is…

• Options: A. nearness to other industrial establishment. B. nearness to raw materials. C. favourable climate conditions. D. availability of storage facilities.

• Correct Option: B. nearness to raw materials

• Explanation: (See Question 16). Reducing the cost of transporting heavy raw materials is the primary economic driver for siting an industry.

25. Petrochemistry is an example of…

• Options: A. pure chemistry. B. applied chemistry. C. biochemistry. D. environmental chemistry.

• Correct Option: B. applied chemistry

• Explanation: Pure chemistry seeks knowledge for knowledge’s sake. Applied chemistry uses chemical principles to solve practical problems or make products. Petrochemistry applies chemical knowledge to turn crude oil into useful plastics, fuels, and fibers.

26. The branch of science that deals with the nature and properties of substance and how one substance can be converted to another is known as…

• Options: A. biology B. chemistry C. geography D. physics.

• Correct Option: B. chemistry

• Explanation: This is the fundamental definition of Chemistry: the study of matter, its properties, and the changes (reactions) it undergoes.

27. Tetraoxosulphate(VI) acid is considered as a heavy chemical because…

• Options: A. its relative molecular mass is high B. a high tonnage is produced every year C. it is an inorganic chemical D. it is used to manufacture heavy chemicals.

• Correct Option: B. a high tonnage is produced every year

• Explanation: The term “Heavy” in “Heavy Chemical” does not refer to weight or density; it refers to the quantity of production. Heavy chemicals are produced in large quantities (tonnage).

28. Biotechnology is applied in the following processes except…

• Options: A. baking of bread. B. production of wine. C. production of antibiotics. D. manufacturing of soap.

• Correct Option: D. manufacturing of soap

• Explanation: (Same as Question 19). Soap making is a chemical process (saponification), not a biological one involving microorganisms. Baking (Yeast), Wine (Yeast), and Antibiotics (Microbes) all rely on biotechnology.