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Class 9 Science Chapter 2 Is Matter Around Us Pure Quiz 3
Welcome to Quiz 3 of Class 9 Science Chapter 2 – Is Matter Around Us Pure! In this quiz, we’ll build on what you’ve already learned in Quiz 1 and Quiz 2 about matter and its composition. After covering the basics in the first two quizzes, it’s time to dive even deeper into these concepts and test your ability to apply the knowledge you’ve gained so far.
In Chapter 2, you’ve explored how matter can be classified into pure substances, such as elements and compounds, and mixtures, which can be homogeneous or heterogeneous. This quiz will challenge your understanding of these key topics, helping you to further solidify your foundation in chemistry.
So, let’s get started with Quiz 3! It’s a perfect opportunity to review, expand your knowledge, and build your confidence in this important subject.
Quiz 3 Rules
- Time Limit: You have 15 minutes to complete the quiz. Use your time wisely.
- Multiple Choices: Each question provides multiple options. Pick the one you think is correct.
- Single Correct Answer: Each question has only one correct answer. Choose the best option based on what you know.
- No Negative Marking: There is no penalty for incorrect answers, so don’t worry about guessing.
Quiz 3 Structure
- Total Questions: 10
- Topics Covered: This quiz focuses on the key ideas from Chapter 2, “Is Matter Around Us Pure.” It includes questions about the classification of matter, the difference between pure substances and mixtures, and methods of separating mixtures.
Good luck, and use what you’ve learned to confidently answer the questions.
Class 9 Chemistry Chapter 2 Is Matter Around Us Pure Quiz Questions
Question 1: Generally which of the following is available in three states?
a) Petrol
b) Water
c) Milk
d) Kerosene
The correct option is
Answer:
The correct answer is b) Water
Based on the arrangement of particles and their properties, water is available mainly in three forms: ice(s) ⇌ Water(𝑙) ⇌ Water vapor(g).
Question 2: Which of the following substances can expand to the greatest extent?
a) Copper
b) Copper sulphate
c) Acetic acid
d) Nitrogen
The correct option is
Answer:
The correct answer is d) Nitrogen
Generally, gases can expand to a greater extent than solids and liquids because there is no intermolecular attraction forces among gas molecules. Copper and Copper sulphate are solids, Acetic acid is a liquid, and Nitrogen is a gas.
Question 3: Emulsions like oil in water are?
a) Homogenous mixtures
b) Heterogeneous mixtures
c) Both
d) None
The correct option is
Answer:
The correct answer is b) Heterogeneous mixtures
Solutions are homogenous mixtures where particles of one substance (the solute) are mixed with the particles of another substance (the solvent). Heterogeneous mixtures have large aggregations (clumps) of substances mixed together, such as emulsions like oil in water.
Question 4: Salty water is an example of
a) Homogenous mixtures
b) Heterogeneous mixtures
c) Both
d) None
The correct option is
Answer:
The correct answer is a) Homogenous mixtures
Solutions are homogenous mixtures where particles of one substance (the solute) are mixed with the particles of another substance (the solvent), such as salty water. Heterogeneous mixtures have large aggregations (clumps) of substances mixed together, such as emulsions like oil in water.
Question 5: The most common type of homogenous mixture is a solution, which can be a solid, liquid, or gas.
a) True
b) False
The correct option is
Answer:
The correct answer is a) True
There are two types of mixtures: heterogeneous and homogeneous. Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout. The most common type of homogenous mixture is a solution, which can be a solid, liquid, or gas.
Question 6: Substances that are made up of two or more pure substances mixed together in any proportion are called __________.
a) Pure substances
b) Elements
c) Compounds
d) Impure substances
The correct option is
Answer:
The correct answer is d) Impure substances
Substances that are made up of two or more pure substances mixed together in any proportion are called impure substances, also known as mixtures. Examples of mixtures include air, seawater, and petroleum.
Question 7: Is it true that substances that are made up of two or more pure substances mixed together in any proportion are called impure substances?
a) True
b) False
The correct option is
Answer:
The correct answer is a) True
The given statement is true. Substances that are made up of two or more pure substances mixed together in any proportion are called impure substances, also known as mixtures. Examples of mixtures include air, seawater, and petroleum.
Question 8: Which of the following is an example of a pure substance?
a) Air
b) Salt solution
c) Water
d) Sugar solution
The correct option is
Answer:
The correct answer is c) Water
The substances which have a definite chemical composition and definite chemical and physical properties are called pure substances. Air, salt solution, and sugar solution consist of two or more components mixed in any proportion, so they are not pure substances. Water is made up of hydrogen and oxygen combined in a fixed ratio of 1:8, making it an example of a compound and thus a pure substance.
Question 9: How can we obtain pure copper sulphate from an impure sample?
a) Crystallization
b) Centrifugation
c) Distillation
d) Fractional distillation
The correct option is
Answer:
The correct answer is a) Crystallization
Crystallization is used to purify solids by separating a pure solid from a solution in the form of its crystals. This method is simpler than evaporation and effectively eliminates impurities.
Question 10: Which of the following solutions is formed when a solid is dissolved in a gas?
a) Solid solution
b) Liquid solution
c) Gaseous solution
d) Both 1 and 3
The correct option is
Answer:
The correct answer is c) Gaseous solution
A solution has two components: solute and solvent. When a solid solute is dissolved in a gaseous solvent, a gaseous solution is formed.
