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Quiz Chapter 5: Water and Solution

10 questions · Form 2 Science Bab 5: Water and Solution

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. How does a larger exposed surface area affect wet clothes drying on a clothesline?

  1. Decreases evaporation because more area absorbs moisture
  2. Increases evaporation rate by allowing more surface water molecules to escape
  3. Has no effect on evaporation rate
  4. Prevents wind from reaching the fabric
Show answer

Answer: B

Spreading clothes out increases total surface area exposed to air, accelerating water evaporation.

2. Why does fine sugar dissolve faster in warm water than coarse sugar crystals in cold water?

  1. Fine sugar has a smaller total surface area and higher temperature slows down dissolution
  2. Higher temperature increases kinetic energy and smaller particle size increases total surface area
  3. Coarse sugar crystals react chemically with cold water to slow dissolution
  4. Warm water reduces the solubility limit of sugar
Show answer

Answer: B

Smaller particle size expands exposed surface area, while higher temperature increases particle kinetic energy and collision rate.

3. Which water treatment process kills bacteria but fails to remove suspended mud particles or dissolved salts?

  1. Distillation
  2. Boiling
  3. Filtration
  4. Sedimentation
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Answer: B

Boiling kills pathogenic bacteria through heat sterilization but leaves all physical solids and dissolved salts behind.

4. What chemical agent is added to municipal water supply systems to prevent tooth decay among consumers?

  1. Chlorine
  2. Alum
  3. Slaked Lime
  4. Sodium Fluoride
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Answer: D

Fluoride compound (sodium fluoride) is added during water treatment specifically to promote dental health and prevent tooth decay.

5. Which organic solvent is most suitable for removing nail polish stains?

  1. Alcohol
  2. Turpentine
  3. Acetone
  4. Kerosene
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Answer: C

Acetone is an organic non-aqueous solvent specifically capable of dissolving nail polish.

6. Why is water commonly referred to as a 'universal solvent'?

  1. It can dissolve every existing substance on Earth
  2. It can dissolve a wider variety of substances than any other liquid solvent
  3. It is the only liquid that forms neutral solutions
  4. It boils at exactly 100°C under all circumstances
Show answer

Answer: B

Water is termed a universal solvent because it dissolves more substances than any other known liquid due to its polar nature.

7. Why is pure water considered a compound rather than an element or mixture?

  1. It consists of two elements (Hydrogen and Oxygen) chemically combined in a fixed ratio
  2. It can be separated physically using filter paper
  3. It has variable boiling points depending on stirring
  4. It contains floating suspended particles
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Answer: A

Water is a chemical compound formed by two hydrogen atoms covalently bonded to one oxygen atom in a fixed 2:1 proportion.

8. What is the volume ratio of Hydrogen to Oxygen gas produced during the electrolysis of pure water?

  1. 1 : 1
  2. 1 : 2
  3. 2 : 1
  4. 3 : 1
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Answer: C

Electrolysis splits water (H2O) into hydrogen and oxygen gases in a 2:1 volume ratio.

9. What type of mixture is formed when chalk powder is shaken vigorously with water and left to stand?

  1. Dilute solution
  2. Saturated solution
  3. Suspension
  4. Colloid
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Answer: C

Chalk powder is insoluble in water, forming a suspension with visible floating particles that settle over time.

10. Which factor decreases the rate of evaporation of water exposed in an open environment?

  1. Higher surrounding temperature
  2. Higher atmospheric humidity
  3. Faster wind speed
  4. Larger exposed surface area
Show answer

Answer: B

High air humidity means the air is already saturated with water vapor, slowing down the rate of evaporation.

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