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Free Industrial Chemistry MCQs with Answers

292 Industrial Chemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.

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292 questions · page 13 of 15

241. Synthetic pheromones, which attract male gypsy moth esters of which of the following acids?

  • A. Acetic acid
  • B. Hexanoic acid
  • C. Decanoic acid
  • D. Dodecanoicacid

Explanation: (Z)-7,8-epoxy-2-methyloctadecane is the synthetic pheromones that attract male gypsy moths.

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Correct answer: Acetic acid

242. The information provided to you---- wrong.

  • A. were
  • B. was
  • C. are
  • D. have been

Explanation: This option is correct because "was" is the singular past tense form of the verb "be," which agrees with the singular subject "The…

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Correct answer: was

243. Spot the error. My brother used to give me an advice but he has stopped doing so.

  • A. Give
  • B. An
  • C. Has
  • D. Doing

Explanation: The word "an" is incorrect because "advice" is an uncountable noun and should not have an article "an" before it.

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Correct answer: An

244. Spot the error. All those who regard ourselves as progressives must stand firm in the face of this new politics.

  • A. who
  • B. ourselves
  • C. firm
  • D. in

Explanation: The error in the sentence is in option (B) "ourselves," which should be replaced with "themselves" to correct the sentence structure and…

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Correct answer: ourselves

245. Each sentence below has a blank indicating that something has been omitted. Choose the word that best fits in with the meaning of the sentence as a whole.The _ laws are hard to follow because they are not clearly defined.

  • A. Amorphous
  • B. Blasphemous
  • C. Dappled
  • D. Deferential

Explanation: The word that best fits in the blank is "amorphous":"The amorphous laws are hard to follow because they are not clearly defined."Amorphous…

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Correct answer: Amorphous

246. In this section of logical deduction, the question consists of a brief passage (usually a report containing certain data regarding some social or economic problem), followed by certain inferences based on it. The student is required to analyze the contents (or data) of the passage and grasp the desirable facts from it. Then, student has to consider each of the given inferences in the context of the given passage. decide upon its degree of truth or falsity and then choose the hest alternative provided accordingly.A radical new surgery procedure, laughed at not long ago, is holding out fresh hope for patients of cardiac myopathy, or enlargement of the heart. The technique, now in Pakistan, allows patients to go home two weeks after the Operation, to lead a near-normal sedentary life. Cardiac myopathy is a condition that has a variety of causative factors. An attack from one of the 20 identified viruses, parasite infection, long-term alcohol abuse and blood pressure could bring it on, and in rare cases, it could follow child birth and is even known to run in families. The condition is marked by an increase in the size of the heart's chambers and a decrease in the efficiency of pumping.The new technique was never tried in Pakistan in the past.

  • A. Definitely true
  • B. Probably true
  • C. Data inadequate
  • D. Probably false
  • E. Definitely false

Explanation: The correct answer is 'Definitely true.' The passage explicitly mentions: 'The technique, now in Pakistan, allows patients to go home two…

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Correct answer: Definitely true

247. Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.6,8,10,14,18,26,34,50,66,?

  • A. 98
  • B. 82
  • C. 90
  • D. 100

Explanation: The given sequence is: 6, 8, 10, 14, 18, 26, 34, 50, 66, ?First, determine the differences between consecutive terms:8 - 6 = 210 - 8 = 214…

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Correct answer: 98

248. In the following question, two statements numbered I and II are given. There may be cause and effect relationship between the two statements. These two statements may be the effect of the same cause or independent causes. These statements may be independent causes without saving any relationship. Read both the statements in question and mark your answer as:A. If statement I is the cause and statement II is its effect;B. If statement II is the cause and statement, I is its effect;C. If both the statements I and II are independent causes;D. If both the statements I and II are effects of independent causes;E. If both the statements I and II are effects of some common causes;I. It is the aim of the city's civic authority to get the air pollution reduced by 20% in the next two months.II. The number of asthma cases in the city is constantly increasing.

  • A. A. If statement I is the cause and statement II is its effect;
  • B. B. If statement II is the cause and statement I is its effect;
  • C. C. If both the statements I and II are independent causes;
  • D. D. If both the statements I and II are effects of independent causes;
  • E. E. If both the statements I and II are effects of some common cause;

Explanation: In this question, Statement II suggests an increase in asthma cases in the city, which is likely a health concern prompting action.

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Correct answer: B. If statement II is the cause and statement I is its effect;

249. In this question, a statement is given followed by two courses of action numbered I and II. It is required to grasp the statement, analyze the problem or policy it mentions and then decide which of the courses of action logically follow / most appropriate.Statement:The killer enteric fever has so far claimed 100 lives in some tribal villages during the past three weeks.Courses of action:I) The residents of these villages should immediately be shifted to a non-infected area.II) The Government should immediately send a medical squad to this area, restrict spread of the killer disease.

  • A. If only I follows
  • B. If only II follows
  • C. If either I or II follows
  • D. If neither I nor II follows
  • E. If both I and II follow

Explanation: The correct answer is Option B: If only II follows. Sending a medical squad is crucial as it directly addresses the control and treatment…

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Correct answer: If only II follows

250. Nylon-6,6 is the polymer of:

  • A. Hexamethylene diamine and Adipic acid
  • B. Ethylene glycol and Phthalic acid
  • C. Ethylene glycol and Adipic acid
  • D. Hexamethylene diamine and Phthalic Acid

Explanation: Nylon-6,6 is a polymer formed by the condensation polymerization of hexamethylene diamine and adipic acid.

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Correct answer: Hexamethylene diamine and Adipic acid

251. Predict which one of the following compound is a monomer of an addition polymer.

  • A. C2H3Cl
  • B. C2H6O
  • C. C6H6
  • D. CH2O

Explanation: Formaldehyde polymerises into metaformaldehyde. Both formaldehyde and acetaldehyde polymerize in the presence of dil.

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Correct answer: CH2O

252. Predict which one of the following substance is used as film forming agent in nail polish?

  • A. Nitrocellulose
  • B. Ethyl acetate
  • C. Butyl stearate
  • D. Glycerol

Explanation: Among the substances commonly used in nail polish, one stands out as the primary film-forming agent: Ethyl acetate: Ethyl acetate is…

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Correct answer: Ethyl acetate

253. Bakelite is formed upon polymerization of:

  • A. Phenol + HCHO dil base -->
  • B. OH + NAOH H2O -->
  • C. OH + H2SO4 H2O -->
  • D. OH + CH3 --C--CL--O H2SO4 -->

Explanation: Reaction of phenol with formaldehyde gives bakelite

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Correct answer: Phenol + HCHO dil base -->

254. What is clinker?

  • A. Roasted calcareous material
  • B. Roasted gypsum
  • C. Roasted argillaceous
  • D. Roasted calcareous and argillaceous material

Explanation: Option D is the correct choice because it accurately describes the composition of clinker as a mixture of roasted calcareous and…

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Correct answer: Roasted calcareous and argillaceous material

255. Which of the following statements is incorrect?

  • A. Order of reaction helps us to determine mechanism of reaction
  • B. Arrhenius equation is used to determine activation energy
  • C. When a specific rate constant has a smaller value, then activation energy is smaller
  • D. A type of catalysis in which reactant and catalyst are in the same phase is known as homogeneous catalysis

Explanation: This statement is incorrect. Activation energy is not directly related to the specific rate constant.

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Correct answer: When a specific rate constant has a smaller value, then activation energy is smaller

256. In the preparation of a soap, the fatty acid containing less than eight carbon atoms is not used, because the soap obtained:

  • A. Forms a colloidal solution with water
  • B. Is insoluble in water
  • C. Does not form an emulsion with the grease
  • D. Forms an emulsion with the grease

Explanation: A soap molecule requires a long, non-polar hydrocarbon tail to effectively dissolve in and emulsify grease particles.

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Correct answer: Does not form an emulsion with the grease

257. Which of the following statements is true?

  • A. Soaps and detergents both are used only in soft water
  • B. Soaps and detergents both are used in soft as well as hard water
  • C. Soap is used effectively only in soft water while detergent can be used in soft as well as hard water
  • D. Detergent is used only in soft water, while soap is used in soft and hard water

Explanation: Soaps react with the calcium and magnesium ions in hard water to form an insoluble precipitate called scum.

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Correct answer: Soap is used effectively only in soft water while detergent can be used in soft as well as hard water

258. Terpeniol and chloroxylenol are the compounds of which of the following classes?

  • A. Disinfectant
  • B. Chemosterilant
  • C. Tranquillisers
  • D. Plant growth hormones

Explanation: The combination of chloroxylenol and terpineol is the active formulation for the well-known antiseptic disinfectant Dettol.

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Correct answer: Disinfectant

259. Which of the following represents liquid propellants?

  • A. N2O4 + acrylic rubber
  • B. N2O4 + UDMH
  • C. Polybutadiene + ammonium perchlorate
  • D. Nitroglycerine + nitrocellulose

Explanation: A liquid propellant system requires a liquid fuel and a liquid oxidizer.

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Correct answer: N2O4 + UDMH

260. Malachite green and rosaniline belong to:

  • A. Azo dyes
  • B. Phthalein dyes
  • C. Anthraquinone dyes
  • D. Triphenylmethane dyes

Explanation: Both malachite green and rosaniline are examples of triphenylmethane dyes.

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Correct answer: Triphenylmethane dyes
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