Case study Questions in Class 9 Science Chapter 2 are very important to solve for your exam. Class 9 Science Chapter 2 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving Class 9 Science Case Study Questions Chapter 2 Is Matter Around Us Pure?
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In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Is Matter Around Us Pure? Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 2 Is Matter Around Us Pure?
Case Study/Passage-Based Questions
Case Study 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 the 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
Answer: (c) Chromatography.
(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 the single band on the filter paper.
Answer: (b) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.
(iii) An application where you can use this technique is:
(a) To separate salt from sand
(b) To separate the wheat from the husk
(c) To separate oil from water
(d) To separate drugs from the blood.
Answer: (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 the soluble solvent.
(c) solutes that dissolve in the same solvent.
(d) solutes that dissolve in the different solvents.
Answer: (c) For the separation of those solutes that dissolve in the same solvent.
(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.
Answer: (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.
Case Study 2: A homogeneous mixture of two or more substances is called a true solution. it consists of solute and solvent. The particle size of the true solution is less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remains suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.
(i) which one of the following is most stable?
A)True solution
B)Suspensions
C)Colloids
D) both A and B
Answer: A)True solution
ii) which type of mixture can be separated by filtration?
A)True
B)Suspensions
C)Colloids
D)All of these
Answer: B)Suspensions
iii) which statement is incorrect about the Tyndall effect. *
A)True solution shows Tyndall effect
B)Suspensions show the Tyndall effect
C)Colloid show Tyndall effect
D)Both B and C show the Tyndall effect
Answer: A)True solution shows Tyndall effect
iv) Which is the correct order of stability of solution *
A) True < Colloid<Suspension
B)Colloid<Suspension<True
C)Colloid<True<Suspension
D)Suspension<Colloid<True
Answer: D)Suspension
Case Study 3:
Matter can be classified into two categories: pure substances and mixtures. Pure substances are made up of a single type of particle and cannot be separated into other substances by physical methods. They have definite and constant properties. On the other hand, mixtures are made up of two or more substances that are physically combined and can be separated into their individual components. Mixtures can be further classified into homogeneous and heterogeneous mixtures. Homogeneous mixtures are uniform in composition, meaning the components are evenly distributed throughout the mixture. Heterogeneous mixtures, on the other hand, have non-uniform composition with visible different parts. It is important to understand the nature of matter around us and differentiate between pure substances and mixtures to comprehend their properties and behavior.
What is the main characteristic of a pure substance?
a) Made up of two or more substances
b) Cannot be separated into other substances
c) Has non-uniform composition
d) Components are evenly distributed
Answer: b) Cannot be separated into other substances
Which of the following is an example of a pure substance?
a) Air
b) Saltwater
c) Gold
d) Soil
Answer: c) Gold
How are mixtures different from pure substances?
a) Mixtures have definite and constant properties
b) Mixtures are made up of a single type of particle
c) Mixtures cannot be separated into other substances
d) Mixtures are physically combined and can be separated
Answer: d) Mixtures are physically combined and can be separated
Which type of mixture has a non-uniform composition?
a) Homogeneous mixture
b) Heterogeneous mixture
Answer: b) Heterogeneous mixture
What is the primary reason for understanding the nature of matter around us?
a) To separate mixtures into pure substances
b) To comprehend the properties and behavior of matter
c) To classify mixtures into homogeneous and heterogeneous
d) To identify the components in pure substances
Answer: b) To comprehend the properties and behavior of matter
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