Basic Concept of Chemistry Class 11:Classification of Matter

Classification of Matter

1. What is the classification of matter at the macroscopic or bulk level?

• Mixture or Pure Substance
• Solid or Liquid
• Element or Compound
• Gas or Liquid

Correct Answer: Mixture or Pure Substance

2. When all constituent particles of a substance are same in chemical nature, it is said to be a:

• Mixture
• Pure Substance
• Heterogeneous Mixture
• Homogeneous Mixture

Correct Answer: Pure Substance

3. A mixture contains particles of how many pure substances?

• One
• Two or More
• Only One
• None

Correct Answer: Two or More

4. The composition of a mixture is:

• Fixed
• Variable
• Uniform
• None of the Above

Correct Answer: Variable

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

• Salt and Sugar
• Tea
• Grains and Pulses
• Sand and Water

Correct Answer: Tea

6. Which of the following is an example of a heterogeneous mixture?

• Air
• Salt Solution
• Grains and Pulses
• Sugar Solution

Correct Answer: Grains and Pulses

7. The components of a mixture can be separated by:

• Physical methods
• Chemical methods
• Biological methods
• None of the above

Correct Answer: Physical methods

8. What is an example of a homogeneous mixture?

• Tea
• Salt and Sand
• Oil and Water
• Sugar and Water

Correct Answer: Sugar and Water

9. A mixture is formed by:

• Two or more pure substances
• A single substance
• Only elements
• None of the above

Correct Answer: Two or more pure substances

10. Which of the following is a characteristic of homogeneous mixtures?

• Uniform composition
• Non-uniform composition
• Visible components
• None of the above

Correct Answer: Uniform composition

11. Mixtures can be separated by:

• Only chemical methods
• Physical methods
• Heat alone
• None of the above

Correct Answer: Physical methods

12. An example of a heterogeneous mixture is:

• Tea
• Salt water
• Oil and water
• Air

Correct Answer: Oil and water

13. A mixture can be:

• Homogeneous
• Heterogeneous
• Both A and B
• Neither A nor B

Correct Answer: Both A and B

14. A homogeneous mixture has:

• Non-uniform composition
• Uniform composition
• Visible components
• All of the above

Correct Answer: Uniform composition

15. Which of the following is an example of a physical separation method?

• Filtration
• Electrolysis
• Combustion
• None of the above

Correct Answer: Filtration

Classification of Matter
At the macroscopic level, matter can be classified into two main categories: mixtures and pure substances. A pure substance consists of particles that are chemically identical, meaning the composition is uniform throughout. On the other hand, a mixture is made up of two or more pure substances, and its composition can vary, depending on the ratio of its components.
Mixtures can further be categorized as either homogeneous or heterogeneous. In a homogeneous mixture, the components are evenly mixed, and their distribution is uniform throughout. Common examples include air and sugar solution. In contrast, a heterogeneous mixture has a non-uniform composition, and sometimes different components are visibly distinguishable. Examples include mixtures of salt and sugar, or grains and pulses.

The components of a mixture can be separated using physical methods such as filtration, crystallization, distillation, or hand-picking, depending on the nature of the mixture. Mixtures are common in daily life, and understanding their properties helps in distinguishing between different substances and their behaviours.