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Quiz Chapter 5: Consumer and Industrial Chemistry

10 questions · Form 5 Chemistry Bab 3: Consumer and Industrial Chemistry

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Graphene is a 2D carbon allotrope. Which property makes graphene highly suitable for touchscreens and flexible electronics?

  1. High density and opacity
  2. High electrical conductivity, transparency, and mechanical flexibility
  3. High solubility in organic solvents
  4. Low thermal conductivity
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Answer: B

Graphene is transparent, flexible, extremely strong, and an excellent conductor of electricity, making it ideal for flexible displays.

2. Which traditional plant is commonly used to soothe skin burns and moisturise skin?

  1. Ginger
  2. Turmeric
  3. Aloe vera
  4. Tongkat Ali
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Answer: C

Aloe vera gel contains soothing compounds widely used for skin burns, sunburns, and moisturising.

3. Nanotechnology operates within which size range of particles?

  1. 1 to 100 micrometres (µm)
  2. 1 to 100 nanometres (nm)
  3. 100 to 1000 nanometres (nm)
  4. 1 to 10 millimetres (mm)
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Answer: B

Nanotechnology specifically deals with structures and materials sized between 1 and 100 nanometres (1 nm = 10⁻⁹ m).

4. What is the byproduct formed along with soap during saponification?

  1. Fatty acid
  2. Glycerol
  3. Ethanol
  4. Sulfonic acid
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Answer: B

Hydrolysis of triglycerides yields soap salts and glycerol (propane-1,2,3-triol).

5. Why are detergents more effective than soaps when washing clothes in hard water?

  1. Detergents produce more foam than soap in pure water
  2. Detergents do not form insoluble scum with calcium and magnesium ions
  3. Detergents are fully biodegradable compared to natural soaps
  4. Detergents contain no hydrophobic hydrocarbon chains
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Answer: B

Detergents form soluble calcium and magnesium salts in hard water, preventing the formation of insoluble scum.

6. Which reaction converts liquid vegetable oil into solid margarine in industry?

  1. Saponification
  2. Esterification
  3. Hydrogenation
  4. Fermentation
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Answer: C

Hydrogenation adds hydrogen gas across C=C double bonds in unsaturated oils using a nickel catalyst at 180 °C to make solid margarine.

7. What reactants are required to produce soap through saponification?

  1. Fat or oil and concentrated alkali
  2. Fatty acid and alcohol
  3. Petroleum fraction and sulfuric acid
  4. Glycerol and dilute hydrochloric acid
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Answer: A

Saponification is the alkaline hydrolysis of fats or oils using concentrated alkalis like NaOH or KOH to produce soap and glycerol.

8. Which component of food additives is added to improve the physical texture and viscosity of jelly or ice cream?

  1. Thickeners
  2. Antioxidants
  3. Preservatives
  4. Flavourings
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Answer: A

Thickeners like gelatin, agar-agar, and starch increase viscosity and give smooth texture to jellies and ice creams.

9. Which part of a soap molecule dissolves in grease during cleansing action?

  1. Hydrophilic ionic head
  2. Hydrophobic hydrocarbon tail
  3. Sodium cation
  4. Glycerol backbone
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Answer: B

The non-polar hydrophobic hydrocarbon tail dissolves in grease, while the polar hydrophilic head stays in water.

10. Which of the following describes a saturated fat?

  1. Contains C=C double bonds and has a low melting point
  2. Derived from plants and remains liquid at room temperature
  3. Contains only single C-C bonds and has a relatively high melting point
  4. Reacts rapidly with bromine water to decolourise it
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Answer: C

Saturated fats contain only single carbon-carbon (C-C) bonds, pack closely together, and have higher melting points.

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