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Free Solutions and Colloids MCQs with Answers

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

Solutions are described using molarity, molality, normality, mole fraction, percentage concentration and parts per million. Coverage also includes vapour-pressure lowering, boiling-point elevation, freezing-point depression and osmotic pressure, then distinguishes true solutions, colloids and suspensions by particle size, stability, light scattering and settling.

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Concentration UnitsColligative PropertiesColloids and Suspensions
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119 questions · page 1 of 6

1. Osmotic pressure (7) does NOT depend on

  • A. Molarity
  • B. unoveal gas constant
  • C. Temperature
  • D. structure of solute particle

Explanation: osmotic pressure does not depend on structure of solute particles but it depend on molarity ,temperature,and solute concentration

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Correct answer: structure of solute particle

2. The osmotic pressure of equimolar solutions of BaCl2, NaCl and sucrose will be in the order:

  • A. Sucrose > NaCl > BaCl2
  • B. Sucrose > BaCl2 > NaCl
  • C. NaCl > BaCl2 > Sucrose
  • D. BaCl2 > NaCl > Sucrose

Explanation: Osmotic pressure is a colligative property, and the more the number of particles more the osmotic pressure.

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Correct answer: BaCl2 > NaCl > Sucrose

3. Consider NaCl produced in the equation: FeCl3+ NaOH → Fe(OH)3 + NaCl 175.5g of NaCl was dissolved in water to make a liter of solution, the molarity would be:

  • A. 0.1 M
  • B. 3 M
  • C. 8 M
  • D. 12 M
  • E. 16 M

Explanation: Molarity = number of moles/volume in dm3 or liters 175.5 g make up 3 moles of NaCl 175.5/58.5 = 3 mol That means 3 mole of NaCl is…

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Correct answer: 3 M

4. An azeotropic mixture of two liquids has a boiling point higher than either of them when it:

  • A. Shows positive deviation from Raoult's law
  • B. Shows negative deviation from Raoult's law
  • C. Shows ideal behaviour
  • D. Is saturated

Explanation: An azeotropic solution is a solution that contains two liquids and has a constant vapour and liquid composition.

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Correct answer: Shows negative deviation from Raoult's law

5. The number of moles of solute dissolved per liter of solution is called:

  • A. Normality
  • B. Molality
  • C. Mole fraction
  • D. Molarity
  • E. Percentage composition

Explanation: Molarity (M) indicates the number of moles of solute per liter of solution.Molality is a property of a solution and is defined as the…

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Correct answer: Molarity

6. From a mixture of CO2 and H2 gases, CO2 can be separated by passing the mixture through:

  • A. Water at high temperature
  • B. Water under high pressure
  • C. Cold water
  • D. Acidified water

Explanation: Carbon dioxide is separated from hydrogen by passing the mixture through the water under high pressure.

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Correct answer: Water under high pressure

7. The solubility product for BaSO4, at 18-25°C is:

  • A. 1.0 x 10^-10 mol2dm-6
  • B. 8.7 x 10^-36 mol2dm-6
  • C. 1.8 x 10^-21 mol2dm-6
  • D. 8.4 x 10^-28 mol2dm-6
  • E. 3.5 x 10^-52 mol2dm-6

Explanation: The solubility product for BaSO4 represents the equilibrium constant for its dissolution reaction.

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Correct answer: 1.0 x 10^-10 mol2dm-6

8. 0.5 molar solution NaOH contains:

  • A. 40g NaOH in one dm3
  • B. 80g NaOH in one dm3
  • C. 10g NaOH in one dm3
  • D. 20g NaOH in one dm3

Explanation: The atomic mass of Na is 23g/mol, the atomic mass of O is 16g/mol, and the atomic mass of H is 1g/mol so, by adding all three atomic…

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Correct answer: 20g NaOH in one dm3

9. The temperature at which one crystalline form changes to other is called _ temperature:

  • A. Critical
  • B. Absolute
  • C. Transition
  • D. None of these

Explanation: The temperature at which one crystalline form changes into another is called the transition temperature or phase transition temperature.

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Correct answer: Transition

10. Aqueous solutions of Iodine and Sodium hydroxide were mixed in a round bottom flask at 70 C. Following chemical reaction was carried out. 3I2 + 6 NaOH → NaIO3 + NaI + H2OThis reaction is termed as:

  • A. Redox reaction
  • B. Precipitation reaction
  • C. Substitution reaction
  • D. Free radical reaction

Explanation: To determine whether such a reaction is a redox reaction, the oxidation states of the reactants and products is compared.

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Correct answer: Redox reaction

11. Elevation of the boiling point is a _ property:

  • A. Colligative
  • B. None of these
  • C. Constitutive
  • D. Additive

Explanation: Boiling point elevation is a colligative property which means it depends on the presence and the number of dissolved particles and not on…

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Correct answer: Colligative

12. For a chemical reaction to occur, particles that collide should:

  • A. All of these
  • B. Have proper orientations
  • C. Have proper energies
  • D. Be in a homogenous mixture

Explanation: The collision theory states that for particles to take part in a chemical reaction, they must collide with one another, have sufficient…

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Correct answer: All of these

13. 10.0 grams of glucose are dissolved in water to make 100 cm3 of its solution, its molarity is:

  • A. 0.55
  • B. 0.1
  • C. 10
  • D. 1

Explanation: 0.55: This option suggests a molarity of 0.55 for the glucose solution.

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Correct answer: 0.55

14. Which one of the following is the correct presentation for Ksp?

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Explanation: The solubility product constant, Ksp , is the equilibrium constant for a solid substance dissolving in an aqueous solution.

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Correct answer: Option B

15. As the number of solute particles increases, the freezing point of the solution:

  • A. Remains the same
  • B. Increases
  • C. First increases, then decreases
  • D. Decreases

Explanation: When a solute is dissolved in a solvent, the freezing point of the solution decreases compared to the pure solvent.

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Correct answer: Decreases

16. Boiling point constants help us to determine:

  • A. Molar masses
  • B. Volumes
  • C. Pressures
  • D. Masses

Explanation: Boiling point elevation is a colligative property that depends on the number of solute particles in a solution.

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Correct answer: Molar masses

17. Mole fraction of any compound is the ratio of moles of all components in a:

  • A. Compound
  • B. Solution
  • C. Molecule
  • D. Solid

Explanation: Mole fraction is the ratio of moles of a particular component to the total number of moles of a solution.

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Correct answer: Solution

18. Molarity is defined as the number of moles of any substance dissolved:

  • A. Per dm3 of water
  • B. In one gram of water
  • C. Per m3 of water
  • D. In 100 ml of water

Explanation: Molarity is the number of moles of any substance dissolved in 1 dm3 of water.

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Correct answer: Per dm3 of water

19. If 18.0 g of glucose is dissolved in 1 kg of water, boiling point of this solution should be:

  • A. 100.52 °C
  • B. 100.00 °C
  • C. 100.052 °C
  • D. Less than 100 °C

Explanation: Mass of glucose = 18 g Mass of solvent = 1 kg Boiling point of pure water = 100°C n (glucose) = 18 / [6(12) + 12(1) + 6(18)] = 18 /180 =…

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Correct answer: 100.052 °C

20. Molal freezing point constant of water is:

  • A. 1.86
  • B. 2.86
  • C. 11.86
  • D. 0.52

Explanation: The molal freezing point depression constant for H2O, Kf , is given as 1.86 °C kg/mole.

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Correct answer: 1.86
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