Are these practice questions for Exploring Mixtures and their Separation based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 9 Science exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Exploring Mixtures and their Separation free?

Yes. Every chapter includes free practice questions for Class 9 students to get you started.

What types of questions are included?

The practice set for Exploring Mixtures and their Separation mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Exploring Mixtures and their Separation for full coverage.

How many practice questions are there for Exploring Mixtures and their Separation?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Exploring Mixtures and their Separation Class 9 Science Practice Questions with Answers

easy

Explain the difference between a solute and a solvent using the example of a salt water solution.

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easy

A student prepares a solution by dissolving 25 g of glucose (

C_6H_{12}O_6

) in 225 g of water. Calculate the concentration of this solution in terms of mass by mass percentage.

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easy

Identify the laboratory apparatus specifically designed to separate a mixture of two immiscible liquids.

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easy

Create a hypothesis to explain why the Tyndall effect is observed in fog but not in clean, dust-free air.

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easy

A student is asked to separate a mixture of oil and water. They propose using filtration. Critique this choice of method and justify why a separating funnel is a more appropriate apparatus.

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easy

Define the process of sublimation and name one substance that undergoes sublimation.

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easy

Name the separation technique that uses high-speed spinning to separate heavier particles from a liquid.

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easy

Compare homogeneous and heterogeneous mixtures. Provide two examples for each and analyze the uniformity of composition in each example.

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easy

Recall the definition of an alloy and provide one example.

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easy

Define a homogeneous mixture and provide two examples mentioned in the text.

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easy

A sample of brass, an alloy, has a mass of 200 g. If brass is composed of 70% copper (Cu) and 30% zinc (Zn) by mass, solve for the mass of copper and zinc in the sample.

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easy

A pharmacist prepares a medicinal syrup by dissolving a solid drug in water. Justify the use of mass by volume percentage (

\% m/v

) for expressing its concentration.

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easy

Name the two primary components that make up a solution.

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medium

Examine the use of a separating funnel to separate a mixture of kerosene and water. Explain the scientific principle behind this technique and why the components form two distinct layers.

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medium

Examine why a beam of light passed through a glass of milk is visible, but the same beam is not visible when passed through a salt solution. Name the phenomenon and explain the underlying principle.

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medium

Design a multi-step experimental procedure to separate a mixture containing iron filings, sand (silicon dioxide), and ammonium chloride into its pure, dry components. Justify the sequence of your proposed steps.

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medium

Contrast the processes of evaporation and crystallization for obtaining a solid solute from a solution. Analyze which method is superior for obtaining a pure substance and why.

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medium

A student has a mixture of acetone (boiling point

56^\circ\text{C}

) and water (boiling point

100^\circ\text{C}

). Apply your knowledge of separation techniques to suggest the most appropriate method for separating these two liquids. Justify your choice.

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medium

Compare and contrast solutions, suspensions, and colloids based on the following properties: (i) particle size, (ii) stability (settling of particles), and (iii) Tyndall effect.

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medium

List three properties that can be used to identify a suspension.

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medium

Design a simple, non-electrical device using common household materials that could demonstrate the principle of centrifugation to separate suspended particles from a liquid, like pulp from orange juice.

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medium

A saline drip is a

0.9\% \text{ m/v}

solution of sodium chloride (NaCl) in water. Calculate the mass of NaCl present in a 250 mL drip bag.

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medium

Summarize the key differences between a solution, a colloid, and a suspension based on the following properties: nature of mixture, particle size, and settling of particles.

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medium

To make a fruit punch, you mix 300 mL of orange juice, 150 mL of pineapple juice, and 50 mL of lemon juice. Assuming no change in volume upon mixing, calculate the volume by volume percentage (% v/v) of each juice in the final punch.

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medium

Explain the principle of separation used in the distillation process.

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medium

A solution is prepared by dissolving

25

g of sugar in

75

g of water. Recall the formula and calculate the mass by mass percentage of this solution.

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medium

Apply the data from the table. If a saturated solution of potassium chloride is prepared in 100 g of water at

80^\circ\text{C}

and then cooled to

30^\circ\text{C}

, calculate the mass of potassium chloride that will crystallize out. Solubility of potassium chloride at

80^\circ\text{C}

is

54 \text{ g}/100 \text{ g}

water and at

30^\circ\text{C}

is

37.4 \text{ g}/100 \text{ g}

water.

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medium

A student attempts to perform paper chromatography to separate the pigments in a leaf extract. They place the chromatography paper in the solvent such that the initial spot of extract is submerged in the solvent. Critique this procedural error and predict the outcome.

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medium

Evaluate the statement: 'All homogeneous mixtures are solutions.' Is this always true?

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medium

You are given three unlabeled beakers containing a salt solution, a starch solution, and muddy water. Create a flowchart of simple tests you would perform to identify each mixture.

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medium

A common antiseptic solution is prepared by mixing an alcohol and water. If a label on the bottle reads '70% v/v alcohol', solve for the volume of alcohol and water required to make 200 mL of this solution.

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medium

Design a procedure to prepare

500 \text{ mL}

of a

10\% \text{ v/v}

solution of acetic acid in water. Formulate the steps, including the necessary calculations, and justify why it is important to add the solute to a portion of the solvent and then add more solvent to reach the final volume.

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medium

You have a sample of crude sea salt which is contaminated with insoluble impurities like sand. Propose a two-step method to obtain pure, dry crystals of sodium chloride from this sample.

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medium

Describe the Tyndall effect and list two examples from the text where it can be observed.

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medium

Analyze the given mixture containing salt, fine sand, and iron filings. Propose a step-by-step procedure to separate these three components and recover each one in a dry state.

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hard

You are given two salts: Potassium Nitrate (

KNO_3

), whose solubility increases significantly with temperature, and Sodium Chloride (

NaCl

), whose solubility changes very little with temperature. Formulate a plan to separate a 50:50 mass mixture of these two salts using the principle of fractional crystallization.

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hard

A food processing company wants to create a stable salad dressing, which is an emulsion of oil and vinegar (acetic acid in water). Propose a method to create a stable emulsion and formulate an explanation of the scientific principle, including the role of a key ingredient you would add.

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hard

You are given a mixture of naphthalene balls, common salt (NaCl), and sand. Demonstrate, with a detailed procedure and reasoning, how you would separate these three substances to recover each component.

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hard

Evaluate the effectiveness of sublimation for purifying a sample of naphthalene contaminated with sand versus purifying a sample of iodine contaminated with another volatile substance like camphor. Justify your evaluation.

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hard

Explain the process of crystallization as a method of separation. Describe the main steps involved in preparing pure crystals from an impure solid sample.

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hard

Describe the three main ways to express the concentration of a solution in terms of percentage, and recall the formula for each.

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hard

A student has a mixture of two miscible liquids, Ethanol (boiling point

78^\circ\text{C}

) and Methanol (boiling point

65^\circ\text{C}

). Evaluate the suitability of simple distillation for this separation and propose a more effective method.

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hard

Analyze a hypothetical paper chromatogram where a spot of black ink separates into three distinct colored spots: blue, red, and yellow. The blue spot travels the farthest, followed by red, and then yellow which travels the least. What can you infer about the solubility and adsorption of these three dyes in the chosen solvent and on the paper?

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hard

A saline drip is labeled as '

0.9\% \text{ m/v}

sodium chloride'. Explain what this label signifies and calculate the mass of sodium chloride in a

500

mL bag of this saline solution.

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hard

You are given two solutions. Solution A is prepared by dissolving

40 \text{ g}

of solute in

160 \text{ g}

of solvent. Solution B is prepared by dissolving

40 \text{ g}

of the same solute in enough solvent to make

200 \text{ mL}

of solution. Evaluate which solution is more concentrated by calculating both mass percentage (

\% m/m

) and mass by volume percentage (

\% m/v

) for each.

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Exploring Mixtures and their SeparationClass 9 Science Practice Questions