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CBSE Class 9  >  Class 9 Notes  >  Science   >  Unit Test: Is Matter Around Us Pure?

Unit Test: Is Matter Around Us Pure?

Time: 1 hour 

M.M. 30 

Attempt all questions. 

  • Question numbers 1 to 5 carry 1 mark each. 
  • Question numbers 6 to 8 carry 2 marks each. 
  • Question numbers 9 to 11 carry 3 marks each. 
  • Question number 12 & 13 carry 5 marks each

Q1: Which of the following is a homogeneous mixture?
a) Oil and water
b) Air
c) Sand and iron filings
d) Soil

Q2: The scattering of light by colloidal particles is known as the __________ effect.

Q3: Which of the following is a suspension?
a) Salt in water
b) Milk
c) Muddy water
d) Sugar solution

Q4: A solution in which no more solute can dissolve at a given temperature is called a __________ solution.

Q5: The process used to separate a mixture of iodine and sand is __________.

Q6: Define a colloid and give an example.

Q7: Explain the Tyndall effect with an example.

Q8: How can we separate a mixture of salt and camphor?

Q9: Differentiate between a solution and a suspension.

Q10: What is the difference between a compound and a mixture?

Q11: Explain how you would separate a mixture of iron filings and sulphur.

Q12: Describe the process of crystallization and its applications.

Q13: Explain the differences between elements, compounds, and mixtures with examples.

You can find the solutions of this Unit Test here: ​Unit Test (Solution): Is Matter Around Us Pure?​​​

The document Unit Test: Is Matter Around Us Pure? is a part of the Class 9 Course Science Class 9.
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FAQs on Unit Test: Is Matter Around Us Pure?

1. What is meant by the term 'pure substance' in chemistry?
Ans. A pure substance is a material that has a uniform and definite composition. It consists of only one type of particle, which can be either an element or a compound. Examples include distilled water and pure gold.
2. How can we differentiate between pure substances and mixtures?
Ans. Pure substances have a constant chemical composition and distinct properties, while mixtures contain two or more different substances that retain their individual properties. Mixtures can be homogeneous (uniform) or heterogeneous (non-uniform).
3. What are some methods to separate mixtures into their components?
Ans. Common methods to separate mixtures include filtration, evaporation, distillation, and chromatography. Each method exploits different physical properties of the components, such as size, boiling point, or solubility.
4. Why is it important to know whether a substance is pure or a mixture?
Ans. Knowing whether a substance is pure or a mixture is crucial for various applications, including chemical reactions, pharmaceuticals, and food safety. Pure substances usually have predictable properties, while mixtures may behave unpredictably.
5. Can you give examples of homogeneous and heterogeneous mixtures?
Ans. Yes, an example of a homogeneous mixture is saltwater, where the salt is completely dissolved. An example of a heterogeneous mixture is a salad, where the different ingredients can be seen and separated easily.
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