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SCIENCE CLASS- 9

Class 9 Science Worksheets: Chapter-5

Chapter-wise worksheets with competency-based questions and board exam practice based on the latest CBSE syllabus.

CBSE Latest Syllabus Chapter-wise Worksheets

Worksheet

Chapter 5: Exploring Mixtures and their Separation

Class: IX     Subject: Science (Chemistry)

Name: _______________________     Roll No.: _______________________

Date: _______________________     Marks: 50     Time: 60 Minutes


Section A : Multiple Choice Questions

Choose the correct answer.

  1. A homogeneous mixture is called
    1. Compound
    2. Solution
    3. Element
    4. Suspension

  2. The component present in larger amount in a solution is called
    1. Solute
    2. Solvent
    3. Mixture
    4. Residue

  3. Which method is used to separate insoluble solid from a liquid?
    1. Filtration
    2. Evaporation
    3. Chromatography
    4. Sublimation

  4. Which separation technique is used to obtain pure salt from salt solution?
    1. Filtration
    2. Evaporation
    3. Magnetic Separation
    4. Sieving

  5. Which of the following is a heterogeneous mixture?
    1. Air
    2. Salt solution
    3. Milk
    4. Sugar solution

  6. Which technique separates coloured components of ink?
    1. Chromatography
    2. Filtration
    3. Distillation
    4. Sedimentation

  7. Which method separates two immiscible liquids?
    1. Separating Funnel
    2. Evaporation
    3. Filtration
    4. Sieving

  8. The process in which a solid changes directly into vapour is called
    1. Condensation
    2. Evaporation
    3. Sublimation
    4. Melting

  9. Which method is used to separate cream from milk?
    1. Centrifugation
    2. Filtration
    3. Sublimation
    4. Distillation

  10. Which method is used to separate two miscible liquids having different boiling points?
    1. Fractional Distillation
    2. Filtration
    3. Sedimentation
    4. Magnetic Separation

Section B : Fill in the Blanks and True/False

Fill in the Blanks

  1. The substance dissolved in a solution is called __________________.
  2. The liquid that dissolves the solute is called __________________.
  3. A solution containing the maximum amount of solute is called a __________________ solution.
  4. __________________ is used to separate dyes from ink.
  5. The boiling point of water is __________________ °C.

Write True or False

  1. Air is a homogeneous mixture. __________
  2. Filtration can separate dissolved salt from water. __________
  3. Sublimation is used to separate ammonium chloride from sand. __________
  4. A suspension is a homogeneous mixture. __________
  5. Distillation can be used to obtain pure water from salt solution. __________

Section C : Match the Following

Column A Column B
1. Filtration A. Ink pigments
2. Chromatography B. Insoluble solid from liquid
3. Sublimation C. Two immiscible liquids
4. Separating Funnel D. Ammonium chloride and sand
5. Distillation E. Pure liquid from solution

Section D : Short Answer and Numerical Questions

  1. Differentiate between a homogeneous mixture and a heterogeneous mixture.

  2. Define:
    • Solute
    • Solvent

  3. What is a saturated solution?

  4. Why is filtration not suitable for separating salt dissolved in water?

  5. Write any four methods used for separation of mixtures.

  6. Calculate the mass by mass percentage of a solution prepared by dissolving 20 g of salt in 180 g of water.

  7. Calculate the mass by volume percentage of a solution containing 10 g sugar dissolved in 100 mL solution.

  8. Calculate the volume by volume percentage of a solution containing 15 mL alcohol in 300 mL solution.

  9. Differentiate between evaporation and distillation.

  10. Explain the principle of chromatography.

Section E : HOTS and Case Study

Assertion and Reason

  1. Assertion (A): Distillation is used to obtain pure water from salt solution.

    Reason (R): Salt does not evaporate with water.
    1. Both A and R are true and R is the correct explanation.
    2. Both A and R are true but R is not the correct explanation.
    3. A is true but R is false.
    4. A is false but R is true.

  2. Assertion (A): Chromatography is used to separate coloured substances.

    Reason (R): Different coloured substances move at different speeds through the stationary phase.
    1. Both A and R are true and R is the correct explanation.
    2. Both A and R are true but R is not the correct explanation.
    3. A is true but R is false.
    4. A is false but R is true.

Case Study

A student prepared a salt solution by dissolving common salt in water. He wanted to recover pure salt and also obtain pure water separately.

  1. Which separation method should he use?
  2. What is the role of the condenser in this process?
  3. Which component has the lower boiling point?
  4. Which substance remains in the flask after heating?
  5. Name one real-life application of distillation.

Bonus Challenge

A solution contains 25 g of sugar dissolved in 225 g of water.

  1. Find the mass of the solution.
  2. Calculate the mass by mass percentage.
  3. Name the solvent.
  4. Name the solute.
  5. Suggest one method to recover pure sugar from the solution.

End of Worksheet