Is Matter Around Us Pure

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CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

Define and explain the concepts of solution, solvent, and solute.
Describe the process of dissolving and the terms soluble and insoluble.
Analyze the solubility of different substances at various temperatures.
Classify mixtures as homogeneous or heterogeneous.
Identify examples of pure substances and mixtures.
Explain the differences between physical and chemical changes.
Understand the characteristics and examples of colloids and suspensions.
Apply knowledge of filtration techniques to separate mixtures.

CBSE Revision Notes & Quick Summary for Last-Minute Study

Notes on Matter

Classification of Matter

Matter (Solid, Liquid, or Gas)
- Pure Substance
  - Elements
    - Cannot be broken down to simpler substances.
    - Examples: copper, oxygen, iron, hydrogen, mercury.
  - Compounds
    - Have a fixed composition.
    - Can be broken down into elements by chemical or electrochemical reactions.
    - Examples: water, methane, sugar, salt.
- Mixtures (No Fixed Composition)
  - Homogeneous
    - Uniform composition.
    - Examples: sugar in water, salt in water, sulfur in carbon disulphide, water in alcohol.
  - Heterogeneous
    - Non-uniform composition.
    - Examples: sand and salt, sugar and salt, water in oil.

Differences Between Mixtures and Compounds

Mixtures	Compounds
1. Elements or compounds just mix together to form a mixture and no new compound is formed.	1. Elements react to form new compounds.
2. A mixture has a variable composition.	2. The composition of each new substance is always fixed.
3. A mixture shows the properties of the constituent substances.	3. The new substance has totally different properties.
4. The constituents can be separated fairly easily by physical methods.	4. The constituents can be separated only by chemical or electrochemical reactions.

Types of Mixtures

Homogeneous Mixtures: Uniform composition, e.g., soda water, vinegar.
Heterogeneous Mixtures: Non-uniform composition, e.g., soil, wood.

Solutions, Suspensions, and Colloids

Solution: A homogeneous mixture of two or more substances, e.g., lemonade.
Suspension: A heterogeneous mixture where particles do not dissolve but remain suspended, e.g., muddy water.
Colloid: A mixture where particles are uniformly spread throughout, e.g., milk.

Filtration Process

Components:
- Filter Paper: Used to separate solids from liquids.
- Funnel: Holds the filter paper.
- Filtrate: The liquid that passes through the filter paper.

Solubility Data Example

Potassium Nitrate Solubility at Different Temperatures:
- 283 K: 21 g
- 293 K: 32 g
- 313 K: 62 g
- 333 K: 106 g
- 353 K: 167 g

Key Concepts

Saturated Solution: A solution that cannot dissolve any more solute at a given temperature.
Colloid: A mixture with particles that are not visible to the naked eye but can scatter light (Tyndall effect).
Suspension: A mixture where particles settle over time and can be separated by filtration.

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Mixtures and Compounds: Students often confuse mixtures with compounds. Remember that mixtures retain the properties of their components, while compounds have different properties.
Solubility Confusion: When asked about solubility at different temperatures, students may forget to refer to the correct data from tables provided in the exam.
Filtration Process: Students might not clearly understand the filtration process and may confuse the terms 'filtrate' and 'residue'. Ensure you know what each term means.
Identifying Pure Substances: Be careful when classifying substances as pure or mixtures. Elements and compounds are pure substances, while mixtures can be homogeneous or heterogeneous.

Tips for Success

Review Definitions: Make sure you can define key terms such as solution, solvent, solute, suspension, and colloid.
Practice with Tables: Familiarize yourself with data tables, especially those showing solubility at various temperatures, as they are often used in exam questions.
Understand the Tyndall Effect: Know which mixtures show the Tyndall effect and why this is significant in distinguishing between solutions and colloids.
Use Examples: When studying, use examples of substances that fit into each category (elements, compounds, mixtures) to reinforce your understanding.
Clarify Physical vs. Chemical Changes: Be able to distinguish between physical and chemical changes, as this is a common area of confusion.

CBSE Quiz & Practice Test – MCQs, True/False Questions with Solutions

Multiple Choice Questions

The solute dissolves more.

The solution becomes unsaturated.

Excess solute precipitates out.

The solute evaporates.

Correct Answer: C

Solution:

When a saturated solution is cooled, the solubility of the solute decreases, causing excess solute to precipitate out.

Gas in liquid

Solid in liquid

Liquid in liquid

Gas in gas

Correct Answer: B

Solution:

The solution is solid in liquid because potassium permanganate (solid) is dissolved in water (liquid).

20%

25%

30%

40%

Correct Answer: B

Solution:

The mass by mass percentage of sugar is calculated as:

\frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 = \frac{20}{20 + 80} \times 100 = 25\%

Mixtures have a fixed composition.

Compounds can be separated by physical methods.

Mixtures show the properties of their constituent substances.

Compounds show the properties of their constituent elements.

Correct Answer: C

Solution:

Mixtures show the properties of their constituent substances because they are physically combined, whereas compounds have new properties.

It has a fixed composition

It can be separated into its components by physical methods

It consists of a single type of particle

It has the same properties throughout

Correct Answer: B

Solution:

A pure substance cannot be separated into its components by physical methods; it consists of a single type of particle and has a fixed composition.

Sand and salt

Oil and water

Sugar dissolved in water

Iron filings and sulfur

Correct Answer: C

Solution:

A homogeneous mixture has a uniform composition throughout. Sugar dissolved in water is a homogeneous mixture because the sugar is evenly distributed in the water.

Filtration

Centrifugation

Distillation

Evaporation

Correct Answer: B

Solution:

Colloidal particles cannot be separated by filtration but can be separated using centrifugation.

Solution

Colloid

Suspension

Pure substance

Correct Answer: B

Solution:

The Tyndall effect, where a beam of light is visible, is characteristic of colloids. The light is scattered by the larger particles in the colloid.

It is the component that dissolves the solute.

It is the component that is dissolved.

It is the component that settles down.

It is the component that cannot be seen.

Correct Answer: A

Solution:

The solvent is the component of a solution that dissolves the solute, usually present in a larger amount.

Colloids are homogeneous mixtures.

Colloids can be separated by filtration.

Colloids do not scatter light.

Colloids are stable and do not settle down.

Correct Answer: D

Solution:

Colloids are stable and do not settle down, making them different from suspensions.

Particles are visible to the naked eye

Particles scatter light but do not settle

Particles settle down when left undisturbed

Particles can be separated by filtration

Correct Answer: B

Solution:

In a colloidal solution, particles are small enough to scatter light (Tyndall effect) but do not settle down.

A homogeneous mixture with particle size less than 1 nm.

A heterogeneous mixture with particle size between 1 nm and 1000 nm.

A homogeneous mixture with particle size greater than 1000 nm.

A heterogeneous mixture with particle size greater than 1000 nm.

Correct Answer: B

Solution:

A colloidal solution is a heterogeneous mixture where the particle size ranges between 1 nm and 1000 nm, allowing it to scatter light and exhibit the Tyndall effect.

Salt dissolved in water

Smoke in air

Sand in water

Sugar dissolved in alcohol

Correct Answer: B

Solution:

Smoke in air is a colloidal solution where solid particles are dispersed in a gas.

Homogeneous mixtures have a uniform composition; heterogeneous mixtures do not.

Heterogeneous mixtures can be separated by physical methods; homogeneous mixtures cannot.

Homogeneous mixtures are always solid; heterogeneous mixtures are always liquid.

Heterogeneous mixtures have a fixed composition; homogeneous mixtures have variable composition.

Correct Answer: A

Solution:

Homogeneous mixtures have a uniform composition throughout, such as solutions, while heterogeneous mixtures have non-uniform composition, such as suspensions.

Sugar

Water

Both sugar and water

Neither sugar nor water

Correct Answer: B

Solution:

In a solution of sugar in water, water is the solvent as it dissolves the sugar.

25%

33.33%

20%

40%

Correct Answer: A

Solution:

Mass of solute (sodium chloride) = 50 g. Mass of solvent (water) = 150 g. Total mass of solution = 50 g + 150 g = 200 g. Mass percentage of sodium chloride = (50 g / 200 g) x 100 = 25%.

10%

11.11%

9.09%

12.5%

Correct Answer: B

Solution:

The mass by mass percentage is calculated as:

\frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 = \frac{10}{100} \times 100 = 10\%

It has a uniform composition throughout.

It can be separated into its components by physical methods.

Its components cannot be seen by the naked eye.

It is a pure substance.

Correct Answer: B

Solution:

Heterogeneous mixtures have non-uniform compositions and can be separated into their components by physical methods.

Particles can be seen with the naked eye.

Exhibits the Tyndall effect.

Particles do not settle down when left undisturbed.

Cannot be separated by ordinary filtration.

Correct Answer: A

Solution:

Colloidal particles are too small to be seen with the naked eye, making option A incorrect. The other options are true characteristics of colloids.

Solvent

Solute

Colloid

Suspension

Correct Answer: B

Solution:

In the tincture of iodine, iodine acts as the solute because it is the component that is dissolved in the alcohol, which is the solvent.

Air

Brass

Water

Sand

Correct Answer: C

Solution:

Water is a compound with a fixed composition that can be broken down into hydrogen and oxygen.

Colloidal particles can be seen with the naked eye.

Colloidal solutions are homogeneous mixtures.

Colloidal particles do not settle down when left undisturbed.

Colloidal solutions can be separated by filtration.

Correct Answer: C

Solution:

Colloidal particles are too small to be seen with the naked eye and do not settle down when left undisturbed, making colloidal solutions stable.

Oil and water

Salt dissolved in water

Sand and salt

Iron filings and sulfur

Correct Answer: B

Solution:

Salt dissolved in water forms a homogeneous mixture because it has a uniform composition throughout.

Filtration

Centrifugation

Evaporation

Distillation

Correct Answer: B

Solution:

Colloidal particles cannot be separated by filtration but can be separated by centrifugation.

Mixtures have a fixed composition, while compounds do not.

Compounds can be separated by physical methods, while mixtures require chemical reactions.

Mixtures show the properties of their constituents, while compounds have different properties from their constituents.

Mixtures are always homogeneous, while compounds are always heterogeneous.

Correct Answer: C

Solution:

Mixtures retain the properties of their constituent substances, whereas compounds have properties different from the elements that form them.

Air

Brass

Water

Sand

Correct Answer: C

Solution:

Water is a compound because it has a fixed composition (H₂O) and can be broken down into hydrogen and oxygen by chemical reactions.

26.5%

36%

26.47%

35.29%

Correct Answer: D

Solution:

The mass of the solution is the sum of the mass of the solute and the solvent, which is 36 g + 100 g = 136 g. The mass percentage is calculated as

\frac{36}{136} \times 100 = 26.47\%

Filtration

Magnetic separation

Distillation

Evaporation

Correct Answer: B

Solution:

Iron filings can be separated from sulfur using a magnet because iron is magnetic, whereas sulfur is not. This method is effective for separating mixtures where one component is magnetic.

It is a homogeneous mixture.

Its particles can be seen with the naked eye.

It is stable and does not settle down.

It can be separated by filtration.

Correct Answer: C

Solution:

A colloidal solution is stable and its particles do not settle down when left undisturbed.

Particles can be seen with the naked eye.

Particles do not scatter light.

Particles can be separated by filtration.

Particles are stable and do not settle down.

Correct Answer: D

Solution:

Colloidal particles are stable and do not settle down due to their small size, which also allows them to scatter light.

The solution will remain saturated.

Some salt will precipitate out of the solution.

The solution will become unsaturated.

The concentration of the solution will increase.

Correct Answer: B

Solution:

Cooling a saturated solution typically results in the precipitation of the solute, as solubility decreases with temperature.

Salt dissolved in water

Air

Sand and salt

Sugar in water

Correct Answer: C

Solution:

Sand and salt is a heterogeneous mixture because it has a non-uniform composition.

20%

25%

30%

35%

Correct Answer: B

Solution:

The mass by mass percentage is calculated as (mass of solute/mass of solution) x 100. Here, the mass of the solution is 50 g + 200 g = 250 g. Thus, the concentration is (50/250) x 100 = 20%.

A solution of salt in water

A mixture of sand and water

A mixture of milk and water

A solution of sugar in water

Correct Answer: C

Solution:

The Tyndall effect is observed in colloidal solutions where the particles are large enough to scatter light. Milk and water form a colloidal mixture where the milk particles scatter light, demonstrating the Tyndall effect.

11.1%

12.5%

10.5%

15%

Correct Answer: A

Solution:

The concentration is calculated using the formula:

\frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 = \frac{40}{360} \times 100 = 11.1\%

Compounds can be separated by physical methods.

Mixtures have a fixed composition.

Compounds have a fixed composition.

Mixtures are pure substances.

Correct Answer: C

Solution:

Compounds have a fixed composition and can only be separated into their elements by chemical reactions, unlike mixtures.

A laser beam passing through a clear glass of water.

Sunlight streaming through the canopy of a dense forest.

A flashlight beam passing through a jar of pure honey.

A beam of light passing through a solution of salt in water.

Correct Answer: B

Solution:

The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions. Sunlight streaming through a dense forest is scattered by tiny water droplets in the air, demonstrating the Tyndall effect.

The particles can be seen with the naked eye.

The particles scatter light.

The particles do not settle down when left undisturbed.

The particles can be separated by filtration.

Correct Answer: C

Solution:

A solution is stable and the particles do not settle down when left undisturbed.

The solution will remain saturated.

More sodium chloride will dissolve.

Sodium chloride will precipitate out.

The concentration of the solution will increase.

Correct Answer: C

Solution:

Upon cooling, the solubility of sodium chloride in water decreases, causing excess solute to precipitate out of the solution.

Particles can be seen with the naked eye.

Particles do not scatter light.

Particles settle down when left undisturbed.

Particles scatter a beam of light passing through it.

Correct Answer: D

Solution:

Colloidal particles are small enough to remain suspended and scatter light, which is why they exhibit the Tyndall effect.

10%

11.1%

12.5%

15%

Correct Answer: C

Solution:

The concentration is calculated as

\frac{20}{200} \times 100 = 10\%

Filtration

Evaporation

Magnetic separation

Distillation

Correct Answer: C

Solution:

Magnetic separation is the most effective method to separate iron filings from sand, as iron is magnetic and sand is not.

20%

25%

30%

40%

Correct Answer: A

Solution:

The concentration is calculated as:

\frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100 = \frac{50}{250} \times 100 = 20\%

Sand and salt

Sugar in water

Oil and water

Iron filings and sand

Correct Answer: B

Solution:

A homogeneous mixture has a uniform composition throughout. Sugar dissolved in water is a homogeneous mixture.

Copper sulfate solution

Salt solution

Milk

Sugar solution

Correct Answer: C

Solution:

The Tyndall effect is observed in colloidal solutions like milk, where the particles are large enough to scatter light.

10%

11.1%

12.5%

15%

Correct Answer: A

Solution:

The mass of the solution is the sum of the mass of solute and solvent, which is 30 g + 270 g = 300 g. The mass by mass percentage is calculated as (mass of solute / mass of solution) x 100 = (30 / 300) x 100 = 10%.

Particles are not visible to the naked eye.

Particles do not settle on standing.

Particles can be separated by filtration.

Particles do not scatter light.

Correct Answer: C

Solution:

In a suspension, the particles are large enough to be seen by the naked eye and can be separated by filtration. They also settle on standing.

Smoke

Milk

Sponge

Jelly

Correct Answer: B

Solution:

An emulsion is a type of colloid where both the dispersed phase and the dispersion medium are liquids. Milk is an example of an emulsion.

The particles dissolve completely

The particles settle down

The particles remain suspended

The suspension becomes a solution

Correct Answer: B

Solution:

In a suspension, the solute particles settle down when left undisturbed, making it unstable.

Particles can be seen with naked eyes.

Particles settle down on standing.

Particles scatter light.

Particles can be separated by filtration.

Correct Answer: C

Solution:

Colloidal particles are small enough to remain suspended and scatter light, showing the Tyndall effect.

It becomes more saturated.

The solute starts to crystallize.

The solute dissolves more.

Nothing happens.

Correct Answer: B

Solution:

Cooling a saturated solution can lead to crystallization of the solute as the solubility decreases with temperature.

Filtration

Centrifugation

Evaporation

Distillation

Correct Answer: C

Solution:

To separate sand and salt, the mixture can be dissolved in water, filtered to remove the sand, and then the salt can be recovered by evaporating the water.

Iodine

Alcohol

Water

Salt

Correct Answer: B

Solution:

In a solution of iodine in alcohol, alcohol acts as the solvent.

Oxygen

Carbon dioxide

Nitrogen

Argon

Correct Answer: C

Solution:

Air is a homogeneous mixture of gases, with nitrogen making up 78% of the composition.

The solubility of the salt will increase.

The solubility of the salt will decrease.

The solubility of the salt will remain unchanged.

The salt will precipitate out of the solution.

Correct Answer: A

Solution:

The solubility of most salts increases with an increase in temperature. Therefore, heating the solution to 323 K will increase the solubility of the salt.

Salt dissolved in water

Air

Sand and iron filings

Sugar dissolved in water

Correct Answer: C

Solution:

A heterogeneous mixture has a non-uniform composition. Sand and iron filings are physically distinct and do not mix uniformly, making it a heterogeneous mixture.

It is a homogeneous mixture.

Its particles do not settle down.

It can be separated by filtration.

It does not scatter light.

Correct Answer: C

Solution:

A suspension is a heterogeneous mixture where the solute particles can be separated by filtration.

Compounds have a variable composition.

Compounds can be separated by physical methods.

Compounds have properties different from their constituent elements.

Compounds are mixtures of elements.

Correct Answer: C

Solution:

Compounds are substances formed when two or more elements react chemically, and they have properties different from their constituent elements. They have a fixed composition and cannot be separated by physical methods.

True or False

Correct Answer: False

Solution:

In a solution, the solute particles are smaller than 1 nm and cannot be seen by the naked eye.

Correct Answer: False

Solution:

A mixture does not have a fixed composition; it can vary, unlike a compound which has a fixed composition.

Correct Answer: False

Solution:

A suspension is an unstable mixture where the solute particles settle down when left undisturbed.

Correct Answer: False

Solution:

A colloidal solution is a heterogeneous mixture, although it appears homogeneous to the naked eye.

Correct Answer: False

Solution:

A solution of sugar in water is a homogeneous mixture because the sugar is evenly distributed throughout the water.

Correct Answer: True

Solution:

The Tyndall effect occurs in colloidal solutions because the particles scatter light, making the path of the light visible.

Correct Answer: False

Solution:

Colloidal solutions appear homogeneous because the particles are small and uniformly distributed, but they are actually heterogeneous mixtures.

Correct Answer: False

Solution:

A mixture of sand and salt is a heterogeneous mixture because it has a non-uniform composition.

Correct Answer: True

Solution:

A pure substance is made up of only one kind of particle and has a uniform composition throughout.

Correct Answer: True

Solution:

The Tyndall effect occurs when light is scattered by particles in a colloid, making the path of light visible. True solutions have particles too small to scatter light.

Correct Answer: True

Solution:

Homogeneous mixtures, such as solutions, have the same composition throughout, unlike heterogeneous mixtures.

Correct Answer: True

Solution:

A solution is defined as a homogeneous mixture where the solute is uniformly distributed within the solvent.

Correct Answer: True

Solution:

A solution is defined as a homogeneous mixture where the composition is uniform throughout.

Correct Answer: True

Solution:

A suspension is a heterogeneous mixture in which the solute particles are suspended in the liquid medium and do not dissolve.

Correct Answer: True

Solution:

Elements are pure substances that cannot be broken down into simpler substances.

Correct Answer: False

Solution:

A suspension is a heterogeneous mixture where the solute particles are visible to the naked eye.

Correct Answer: False

Solution:

Elements cannot be broken down into simpler substances by chemical reactions; they are the simplest form of matter.

Correct Answer: False

Solution:

In suspensions, the solute particles are large enough to settle down when left undisturbed, making the suspension unstable.

Correct Answer: True

Solution:

The Tyndall effect occurs in colloids because the particles are large enough to scatter light, making the path of light visible.

Correct Answer: True

Solution:

In a mixture, the individual elements or compounds retain their original properties.

Correct Answer: False

Solution:

The particles of a solution are smaller than 1 nm in diameter and cannot be seen by the naked eye.

Correct Answer: True

Solution:

Mixtures consist of two or more substances mixed together without a fixed ratio, whereas compounds have a fixed composition as they are formed by chemical reactions.

Correct Answer: False

Solution:

Colloids cannot be separated by filtration due to the small size of their particles. Special techniques like centrifugation are required.

Correct Answer: True

Solution:

Homogeneous mixtures, such as solutions, have a uniform composition throughout, meaning the components are evenly distributed.

Correct Answer: False

Solution:

A compound has a fixed composition and cannot vary, unlike mixtures which can have variable compositions.

Is Matter Around Us Pure

AI Learning Assistant

CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

CBSE Revision Notes & Quick Summary for Last-Minute Study

Notes on Matter

Classification of Matter

Differences Between Mixtures and Compounds

Types of Mixtures

Solutions, Suspensions, and Colloids

Filtration Process

Solubility Data Example

Key Concepts

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Tips for Success

Multiple Choice Questions

Q1.In the context of solutions, what happens when a saturated solution is cooled slowly?

Correct Answer: C

Q2.In a laboratory experiment, a student prepares a solution by dissolving 10 g of potassium permanganate in 90 g of water. What type of solution is this?

Correct Answer: B

Q3.In a laboratory experiment, a student dissolves 20 g of sugar in 80 g of water. What is the mass by mass percentage of sugar in the solution?

Correct Answer: B

Q4.Which of the following statements about mixtures and compounds is true?

Correct Answer: C

Q5.Which of the following is NOT a characteristic of a pure substance?

Correct Answer: B

Q6.Which of the following mixtures is an example of a homogeneous mixture?

Correct Answer: C

Q7.Which method can be used to separate colloidal particles?

Correct Answer: B

Q8.A student observes that a beam of light is visible when passed through a mixture. Which type of mixture is the student most likely observing?

Correct Answer: B

Q9.What is the role of the solvent in a solution?

Correct Answer: A

Q10.Which of the following statements is true about colloids?

Correct Answer: D

Q11.What is the main characteristic of a colloidal solution?

Correct Answer: B

Q12.Which of the following best describes a colloidal solution?

Correct Answer: B

Q13.Which of the following is an example of a colloidal solution?

Correct Answer: B

Q14.Which of the following statements correctly differentiates between a homogeneous and a heterogeneous mixture?

Correct Answer: A

Q15.What is the solvent in a solution of sugar in water?

Correct Answer: B

Q16.Consider a solution where 50 g of sodium chloride is dissolved in 150 g of water. What is the mass by mass percentage of sodium chloride in this solution?

Correct Answer: A

Q17.A solution contains 10 g of solute in 90 g of solvent. What is the mass by mass percentage of the solute in the solution?

Correct Answer: B

Q18.Which of the following statements correctly describes a heterogeneous mixture?

Correct Answer: B

Q19.Which of the following is NOT a characteristic of a colloidal solution?

Correct Answer: A

Q20.A solution of iodine in alcohol is known as 'tincture of iodine'. In this solution, what is the role of iodine?

Correct Answer: B

Q21.Which of the following is an example of a compound?

Correct Answer: C

Q22.Which of the following statements is true about colloidal solutions?

Correct Answer: C

Q23.Which of the following mixtures is homogeneous?

Correct Answer: B

Q24.How can the components of a colloidal solution be separated?

Correct Answer: B

Q25.Which of the following statements correctly differentiates between a mixture and a compound?

Correct Answer: C

Q26.Which of the following is an example of a compound?

Correct Answer: C

Q27.In a laboratory experiment, a student is tasked with creating a saturated solution of sodium chloride at 293 K. If 36 g of sodium chloride is required to saturate 100 g of water at this temperature, what is the concentration of the solution in terms of mass by mass percentage?

Correct Answer: D

Q28.A chemist is tasked with separating a mixture of iron filings and sulfur. Which method should be used to separate the components effectively?

Correct Answer: B

Q29.Which of the following statements is true about a colloidal solution?

Correct Answer: C

Q30.A colloidal solution is characterized by which of the following properties?

Correct Answer: D

Q31.In a laboratory experiment, a student is asked to prepare a saturated solution using 40 g of salt in 200 g of water at 298 K. What will happen if the solution is cooled to 288 K?

Correct Answer: B