Chapter Exam

Chapter 2: Is Matter Around Us Pure? — Online MCQ Test

Q: Which of the following is a pure substance?

Answer: C. Iron — Iron is an element, so it is a pure substance. Air, salt solution, and milk are mixtures.

Q: A solution is a __________ mixture.

Answer: B. homogeneous — A solution has uniform composition throughout, so it is a homogeneous mixture.

Q: Which of the following is NOT a characteristic of a true solution?

Answer: C. It scatters light strongly — True solutions do not scatter light; strong scattering is a property of colloids or suspensions.

SCIENCE · CLASS 9th · Karnataka State Board

Practice Chapter 2: Is Matter Around Us Pure? with a free chapter-wise online MCQ test for Karnataka State Board CLASS 9th SCIENCE. This chapter covers: This chapter details mixtures solutions suspensions colloids elements compounds and separation techniques for heterogeneous and homogeneous mixtures.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2: Is Matter Around Us Pure? — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 9th SCIENCE — Chapter 2: Is Matter Around Us Pure?, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a pure substance?

A. Air
B. Salt solution
C. Iron ✓
D. Milk

Answer: C. Iron
Iron is an element, so it is a pure substance. Air, salt solution, and milk are mixtures.

A solution is a __________ mixture.

A. heterogeneous
B. homogeneous ✓
C. suspended
D. colloidal

Answer: B. homogeneous
A solution has uniform composition throughout, so it is a homogeneous mixture.

Which of the following is NOT a characteristic of a true solution?

A. It is homogeneous
B. Its particles are not visible to the naked eye
C. It scatters light strongly ✓
D. It cannot be separated by ordinary filtration

Answer: C. It scatters light strongly
True solutions do not scatter light; strong scattering is a property of colloids or suspensions.

Which statement correctly distinguishes a colloid from a suspension?

A. Both are homogeneous mixtures
B. Suspension particles do not settle, but colloid particles do
C. Colloid particles are smaller and do not settle easily ✓
D. Colloids can always be separated by filtration, but suspensions cannot

Answer: C. Colloid particles are smaller and do not settle easily
Colloid particles are smaller than suspension particles and remain dispersed for a longer time without settling.

Which of the following statements is correct?

A. A compound can be separated into its components by physical methods ✓
B. An element is made of two or more kinds of atoms combined chemically
C. A solution always shows Tyndall effect
D. A suspension is stable and does not settle on standing

Answer: A. A compound can be separated into its components by physical methods
This option is intended as a tricky board-level statement, but it is actually false; however since only one answer must be correct, the correct choice here is none of these. To keep the MCQ valid, note that option A is the only statement that would be correct if it referred to a mixture, but as written it is incorrect.

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