case study questions chemistry class 9 chapter 2

• Is Matter Around Us Pure Class 9 Case Study Questions Science Chapter 2

Last Updated on September 1, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 9 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 9 science. In this article, you will find case study questions for cbse class 9 science chapter 2 Is Matter Around Us Pure.

Table of Contents

Case Study Questions on Is Matter Around Us Pure

Question 1:

A group of students took an old shoe box and covered it with a black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. They placed a milk sample contained in a tumbler in the box as shown in the figure below. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it.

Read the given passage carefully and give the answer of the following questions:

Q 1. Explain why the milk sample was illuminated? Name the phenomenon involved.

Q2. Same results were not observed with a salt solution. Explain.

Q 3. Can you suggest two more solutions which would show the same effect as shown by the milk solution?

Q 4. Give one example of above phenomenon observed in our surroundings.

• Because milk is a colloidal solution and would show Tyndall effect.
• Salt solution is a true solution and would not scatter light.
• Soap solution and ink solution.
• Tyndall effect is observed when sunlight passes through the canopy of a dense forest.

Case study questions for other chapters of class 9 science is given below.

• Improvement in Food Resources Class 9 Case Study Questions Science Chapter 12
• Sound Class 9 Case Study Questions Science Chapter 11
• Work and Energy Class 9 Case Study Questions Science Chapter 10
• Gravitation Class 9 Case Study Questions Science Chapter 9
• Force and Laws of Motion Class 9 Case Study Questions Science Chapter 8
• Motion Class 9 Case Study Questions Science Chapter 7
• Tissues Class 9 Case Study Questions Science Chapter 6

The Fundamental Unit of Life Class 9 Case Study Questions Science Chapter 5

Matter in our surroundings class 9 case study questions science chapter 1.

We hope the given case study questions for Is Matter Around Us Pure Class 9 helps you in your learning.

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• Download Latest Sample Papers for CBSE Class 9 Science
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• Download Chapter Tests for CBSE Class 9 Science
• Download Case Study Question Bank for CBSE Class 9 Science
• Download Numerical Problems for CBSE Class 9 Physics
• Download Important MCQs for CBSE Class 9 Physics

Topics from which case study questions may be asked

• Separation Techniques
• Concentration of Solutions
• Physical and Chemical Change
• Experiments and Observations

This chapter deals with the basic understanding of mixtures, solutions, separation techniques, physical change and chemical change. case study questions based on above topics may be asked.

Frequently Asked Questions (FAQs) on Is Matter Around Us Pure Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 9 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 9 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on “Is Matter Around Us Pure” for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on “Is Matter Around Us Pure” class 9 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Is Matter Around Us Pure”.

Q7: What is meant by a substance?

A7: A material that consists of a single type of particles is known as pure substance. All constituent particles of pure substance have the same chemical nature.

Q8: List the points of differences between homogeneous and heterogeneous mixtures

A8: A homogeneous mixture is a mixture having a uniform composition throughout the mixture. For example: Salt in water, sugar in water, copper sulphate in water. A heterogeneous mixture is a mixture having a non-uniform composition throughout the mixture. For example: Sodium chloride and iron fillings, salt and sulphur, oil and water.

Q9: How can we check the purity of a substance?

A9: The purity of a substance can be checked by its melting point and boiling point. A pure substance has a fixed melting point or boiling point at constant pressure.

Q10: Define element.

A10: An element is a basic form of matter that cannot be broken down into simpler substances by chemical reaction. An element consists of only one kind of atom.

Q11: Define compound.

A11: A compound is a substance made up of two or more elements chemically combined with one another. A compound always contains a definite proportion of the elements by mass.

Q12: Name the three states of matter.

A12: The three states of matter are solid, liquid and gas.

Q13: Name the metal which is liquid at room temperature.

A13: Mercury

Q14: How will you separate a mixture of mercury, kerosene and water?

A14: The mixture of mercury, kerosene and water is taken in a separating funnel. Separating funnel is used to separate two immiscible liquids. The principle is that immiscible liquids separate out in layers depending on their densities. Mercury being the heaviest from the bottom layer, water form the middle layer and kerosene form the top layer. On opening the tap, mercury will run out first, followed by water and kerosene at the end

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Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure?

• Last modified on: 3 months ago
• Reading Time: 5 Minutes

Case Study Questions:

Question 1:

Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita. (a) Sedimentation (b) Filtration (c) Chromatography (d) Distillation

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see single band on the filter paper.

(iii) An application where you can use this technique is: (a) To separate salt from sand (b) To separate wheat from husk (c) To separate oil from water (d) To separate drugs from blood.

(iv) The above process is used for the separation of : (a) insoluble substances (b) single solute that dissolves in soluble solvent. (c) solutes that dissolve in the same solvent. (d) solutes that dissolve in the different solvents.

(v) What is chromatography ? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities (c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

• CBSE Case Study Questions (6th – 12th) – All Subjects
• CBSE Assertion Reason Questions (6th – 12th) – All Subjects

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Class 9 Science Chapter 2 Case Based Questions - Is Matter Around Us Pure??

(I) Read the given passage and answer the questions that follow based on the passage and related studied concepts. A pure substance consist of single type of particles. Mixture consist of more than one kind of pure form of matter. Mixtures can be separated by physical methods but pure substances especially compounds cannot be separated into chemical constituents by physical methods. Pure substance has same composition throughout. Soil and soft drinks are mixtures. Mixtures can be separated by various methods depending upon nature of substance present in it. Solution is a homogeneous mixture.

Q1: Name the process by which pure NaCl can be obtained from salt solution. Ans: Crystallisation

Q2: What are alloys-compounds or mixtures? Ans:  Alloys are homogeneous mixtures of two or more metals or a metal and a non-metal e.g. Brass is alloy of Cu and Zn

Q3: What is size of particles in solution? Ans: The size of particles in solutions are less than 1nm (10 –9 m).

Q4: What is solute and solvent in cold drinks? Ans: CO 2  gas, sugar, preservative are solute and water is solvent in cold drinks.

Q2: How can gases be separated that are present in air? Ans:  By fractional distillation of liquid air.

Q3: If sample of urea has melting point 129°C, then: (a)  It is impure (b) It is pure (c)  It can not be predicted (d) The compound is not urea Ans: (a) It is impure

Q4: Which of the following will have boiling point 100°C? (a) Distilled water (b) Sea water (c) River water (d) Well water Ans: (a) Distilled water will have boiling point 100°C.

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Class 9 Science Case Study Questions PDF Download

• Post author: studyrate
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Class 9 Science Case Study Questions play a crucial role in the field of science education as they provide real-life scenarios for students to analyze, apply their knowledge, and develop problem-solving skills. This article aims to present a comprehensive collection of case study questions for Class 9 Science , covering various topics and concepts.

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

CBSE Class 9 Science Exam will have a set of questions based on case studies in the form of MCQs. The CBSE Class 9 Science Question Bank on Case Studies, provided in this article, can be very helpful to understand the new format of questions. Share this link with your friends.

If you want to want to prepare all the tough, tricky & difficult questions for your upcoming exams, this is where you should hang out.  CBSE Case Study Questions for Class 9  will provide you with detailed, latest, comprehensive & confidence-inspiring solutions to the maximum number of Case Study Questions covering all the topics from your  NCERT Text Books !

Table of Contents

CBSE Class 9th SCIENCE Chapterwise Case Study Question & Solution

Case study questions provide students with real-life scenarios that require critical thinking and application of scientific concepts. They help students understand the practical application of scientific principles and develop problem-solving skills in various scientific disciplines.

Chapterwise Case Study Questions for Class 9 Science

Inboard exams, students will find the questions based on assertion and reasoning. Also, there will be a few questions based on case studies. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. For Science subjects, there would be 5 case-based sub-part questions, wherein a student has to attempt 4 sub-part questions.

• Case Study Questions for Chapter 1 Matter in Our Surroundings
• Case Study Questions for Chapter 2 Is Matter Around Us Pure?
• Case Study Questions for Chapter 3 Atoms and Molecules
• Case Study Questions for Chapter 4 Structure of Atom
• Case Study Questions for Chapter 5 The Fundamental Unit of Life
• Case Study Questions for Chapter 6 Tissues
• Case Study Questions for Chapter 7 Diversity in Living Organisms
• Case Study Questions for Chapter 8 Motion
• Case Study Questions for Chapter 9 Force and Laws of Motion
• Case Study Questions for Chapter 10 Gravitation
• Case Study Questions for Chapter 11 Work and Energy
• Case Study Questions for Chapter 12 Sound
• Case Study Questions for Chapter 13 Why do we Fall ill
• Case Study Questions for Chapter 14 Natural Resources
• Case Study Questions for Chapter 15 Improvement in Food Resources

The above  Case studies for Class 9 Science  will help you to boost your scores as Case Study questions have been coming in your examinations. These CBSE Class 9 Science Case Studies have been developed by experienced teachers of schools.studyrate.in for the benefit of Class 10 students.

Class 9 Maths Case Study Questions

Benefits of Case Studies in Science Education

Case studies offer several advantages over traditional teaching methods. Here are some key benefits:

• Real-World Application : Case studies present authentic scenarios, enabling students to understand how scientific concepts are applied in real-life situations.
• Critical Thinking : Analyzing case studies requires students to think critically, make connections, and apply scientific knowledge to solve problems.
• Interdisciplinary Approach : Case studies often involve multiple scientific disciplines, fostering an interdisciplinary understanding of complex issues.
• Engagement and Active Learning : Case studies actively engage students in the learning process, promoting active participation, discussion, and collaboration.
• Skill Development : Case studies develop essential skills such as analytical thinking, problem-solving, and effective communication of scientific concepts.

Importance of Practicing Case Study Questions

Practicing case study questions is crucial for Class 9 Science students to enhance their understanding and application of scientific concepts. Here’s why it is important:

• Application of Knowledge : Case studies allow students to apply their theoretical knowledge to practical situations, bridging the gap between theory and real-world scenarios.
• Developing Analytical Skills : Analyzing case studies improves students’ ability to identify relevant information, make connections, and draw logical conclusions.
• Problem-Solving Skills : Case studies present complex problems that require students to think critically and develop effective problem-solving strategies.
• Enhanced Exam Performance : Practicing case study questions familiarizes students with the format and types of questions they may encounter in exams, leading to improved performance.

Subjects Covered in the Case Study Questions for Class 9 Science

The case study questions for Class 9 Science cover the following subjects:

• Motion and Forces
• Light and Reflection
• Electricity
• Matter and Its Properties
• Atoms and Molecules
• Structure of the Atom
• Chemical Reactions
• Cell: The Fundamental Unit of Life
• Diversity in Living Organisms
• Natural Resources

Tips for Approaching Case Study Questions

To tackle case study questions effectively, consider the following tips:

• Read Carefully : Pay close attention to the details provided in the case study, as they hold crucial information for solving the problem.
• Analyze Methodically : Break down the problem into smaller components and analyze each part systematically.
• Apply Relevant Concepts : Identify the scientific principles relevant to the case study and apply them appropriately.
• Consider Multiple Perspectives : Explore different angles and viewpoints while proposing solutions, taking into account various scientific factors.
• Provide Justifications : Support your answers with scientific explanations and logical reasoning to strengthen your responses.

The Class 9 Science Case Study Questions provided in this article serve as a valuable resource for students seeking to enhance their scientific knowledge and problem-solving skills. By practicing these case studies, students can develop a deeper understanding of scientific concepts and their practical applications. Embrace this opportunity to engage with real-world scenarios and strengthen your scientific acumen.

Q1: Are the Class 9 Science Case Study Questions aligned with the official curriculum?

Yes, the Class 9 Science Case Study Questions presented in this article are aligned with the official curriculum. They cover relevant topics and concepts that students need to study for their exams.

Q2: Can practicing case study questions alone guarantee success in Class 9 Science exams?

Practicing case study questions is an important part of exam preparation, but it should be complemented with a thorough understanding of the subject matter. It is advisable to study the concepts in detail, refer to textbooks, and engage in other learning activities to achieve success in exams.

Q3: Where I Can get Class 9 Science Case Study Questions ?

You can practice Class 9 Science Case Study Questions on schools.studyrate.in for free.

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Class 9th Science - Is Matter Around Us Pure Case Study Questions and Answers 2022 - 2023

By QB365 on 09 Sep, 2022

QB365 provides a detailed and simple solution for every Possible Case Study Questions in Class 9th Science Subject - Is Matter Around Us Pure, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Is matter around us pure case study questions with answer key.

9th Standard CBSE

Final Semester - June 2015

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see single band on the filter paper. iii) Give one application where you can use this technique. (a) To separate salt from sand (b) To separate wheat from husk (c) To separate oil from water (d) To separate drugs from blood. (iv) For the separation of what kind of substances is the above process used ? (a) For the separation of insoluble substances (b) For the separation of single solute that dissolves in single solvent. (c) For the separation of those solutes that dissolve in the same solvent. (d) For the separation of those solutes that dissolve in the different solvents. (v) What is chromatography ? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities (c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

(ii) Oil from water.

(iii) Sodium chloride from its solution in water.

(iv) Camphor from salt.

(v) Cream from milk

(ii) Which type of substance can be separated by this method ? (a) Any solvent from its non-volatile solute. (b) The volatile solvent from its non-volatile solute. (c) The non-volatile solvent from its non-volatile solute. (d) The volatile solvent from its volatile solute. (iii) What can we interpret about the nature of ink ?

(iv) Name the component which gets evaporated. ( a) Heating leads to the evaporation of water. (b) Heating leads to the evaporation of dyes. (c) Heating leads to the filtration of water. (d) Heating leads to the distillation of dyes. (v) Define the process shown in the diagram (a) It is the process of conversion of a liquid into its vapours. (b) It is a process of separating insoluble component by filtering the solution (c) It is a process that separates a pure solid in the form of its crystals (d) It is a technique to separate two miscible liquids

(ii) One of the following does not undergo sublimation. This one is :

(iii) The conversion of a solid into vapours without passing through the liquid state is called : 

(iv) When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :

(v) During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :

*****************************************

Is matter around us pure case study questions with answer key answer keys.

(i) (c) Chromatography (ii) (b) We would see three bands on the filter paper at various lengths. (iii) (d) To separate drugs from blood. (iv) (c) For the separation of those solutes that dissolve in the same solvent. (v) (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

(i) (b) Sedimentation and Decantation. (ii) (c) Separating funnel (iii) (d) Evaporation (iv) (c) Sublimation (v) (d) Centrifugation.

(i) (a) Boiling (ii) (b) The volatile solvent from its non-volatile solute. (iii) (d) Ink is a mixture of dyes in water. (iv) (a) Heating leads to the evaporation of water. (v) (a) It is the process of conversion of a liquid into its vapours.

(i) (c) sublimation (ii) (b) sodium chloride (iii) (c) sublimation (iv) (d) does not rise at all (v) (d) evaporation.

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9th Class Science Is Matter Around Us Pure Question Bank

Done case based mcqs - is matter around us pure total questions - 30.

A) an element    done clear

B) a compound done clear

C) a mixture done clear

D) a solution done clear

question_answer 2) Which of the following substances is a compound?

A) Oxygen          done clear

B) Common salt done clear

C) Gold                                         done clear

D) Air done clear

question_answer 3) The substance formed by mixing, crushing and heating iron filings sulphur powder is

A) an element      done clear

C) a mixture        done clear

question_answer 4) Which of the following property does not prove that water is a compound?

A) Water is made up of two different elements done clear

B) Water has fixed boiling point done clear

C) The constituents of water cannot be separated by simple physical methods done clear

D) Distilled water and tap water have same taste and constituents done clear

question_answer 5) Blood is considered as:

A) an element                                 done clear

C) a mixture        done clear

A) I                     done clear

B) III done clear

C) IV                                             done clear

D) II done clear

question_answer 7) Which substance show maximum change in its solubility, when the temperature is raised from 313 K to 333 K.

B) II done clear

C) III done clear

D) IV done clear

question_answer 8) In the above question, if the amount of water taken is reduced by 20 per cent, what amount of ammonium chloride would be required to prepare its saturated solution at 353 K?

A) 86g                                           done clear

B) 53g done clear

C) 50g                                           done clear

D) 36g done clear

question_answer 9) What is the effect of temperature on the solubility of a salt?

A) It increases with decrease in temperature done clear

B) It decreases with increase in temperature done clear

C) It increases with increase in temperature done clear

D) It does not depend on temperature done clear

question_answer 10) To make lemonade, salts is added in water. The addition of salt in water is a.......

A) suspension                                 done clear

B) colloid done clear

C) heterogeneous solution done clear

D) homogeneous solution done clear

A) In first case, the path is visible because of the presence of impurities done clear

B) In second case, the particles settle down done clear

C) In second case, the concentration increases done clear

D) In second case, the impurities dissolve in the solution done clear

question_answer 12) What is the nature of solution obtained, when X is added to water?

A) Colloid           done clear

B) True solution done clear

C) Suspension       done clear

D) Data insufficient done clear

question_answer 13) Which of the following show Tyndall effect?

A) Sugar solution done clear

B) Salt solution done clear

C) Starch solution done clear

D) Copper sulphate solution done clear

question_answer 14) Which of the following is an example of colloidal solution?

A) Milk                                          done clear

B) Urea done clear

C) Sugar in water done clear

D) Common salt in water done clear

question_answer 15) When the light passes through the solution in this experiment, then

A) scattering of light is observed done clear

B) path of light becomes visible done clear

C) Tyndall effect is observed done clear

D) AII of the above done clear

A) maintain equal composition of substance done clear

B) obtain a pure sample of a substance done clear

C) make it homogeneous mixture done clear

question_answer 17) The mixture of ethyl alcohol and water can be separated by

A) distillation        done clear

B) centrifugation done clear

C) filtration          done clear

D) chromatography done clear

question_answer 18) Which of the following technique is used by farmers in village to purify food grains?

A) Sieving          done clear

B) Hand picking done clear

C) Winnowing       done clear

D) AII of these done clear

question_answer 19) The principle of separation based on

A) the difference in sizes of constituents done clear

B) the difference in physical or chemical properties of constituents done clear

C) the different techniques done clear

question_answer 20) By filtration, which of the following mixture can be separated?

A) Sugar in water                            done clear

B) Milk in water done clear

C) Sand in water done clear

D) Oil in water done clear

A) size                                           done clear

B) temperature done clear

C) phase           done clear

D) proportions done clear

question_answer 22) The interconversion of solid, liquid and gas state is a

A) physical change  done clear

B) chemical change done clear

C) Both [a] and [b]  done clear

D) no change done clear

question_answer 23) Burning is a chemical change and burning of candle is

question_answer 24) Colour, hardness, melting points, boiling points, odour, etc., are

A) chemical properties done clear

B) physical properties done clear

C) Both [a] and [b] done clear

D) example of chemical reactions done clear

question_answer 25) Chemical changes are

A) temporary and irreversible done clear

B) permanent and irreversible done clear

C) permanent and reversible done clear

D) temporary and reversible done clear

A) Chloroform and water done clear

B) Milk and water done clear

C) Acetone and ethanol done clear

D) Impurities in sea water done clear

question_answer 27) The distillation is the best technique to separate liquids having different.

A) Solubility                                   done clear

B) Melting points done clear

C) Boiling point      done clear

question_answer 28) The residue left in the round bottom flask in the distillation process is a liquid having

A) high boiling point done clear

B) low boiling point done clear

C) impurity         done clear

D) high solubility done clear

question_answer 29) The observation made from distillation process is

A) acetone boils first done clear

B) water boils first done clear

C) impurity evaporates done clear

D) water boils at 363 K done clear

question_answer 30) The distillation process involves the

A) decomposition and condensation processes done clear

B) evaporation and condensation processes done clear

C) heating and sublimation processes done clear

D) only evaporation process done clear

Study Package

Case Based MCQs - Is Matter Around us Pure

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