Class 9 Science Chapter 5: Exploring Mixtures and their Separation — practice questions with answers
Free practice for Class 9 Science, Chapter 5: Exploring Mixtures and their Separation. Try the solved questions below, then take a free test with instant marking and explanations.
55 questions18 easy, 27 medium, 10 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. A well-stirred sugar solution tastes equally sweet in the first and last sip. What type of mixture is it?
- Homogeneous
- Heterogeneous
- Suspension
- Colloid
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Answer: A. Homogeneous
Why: Uniform composition throughout. [p.73]
Why: Uniform composition throughout. [p.73]
Q2. Which of these is a heterogeneous mixture?
- Sand in water
- Vinegar
- Soda water
- Sugar solution
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Answer: A. Sand in water
Why: Sand is visible and settles. [p.73]
Why: Sand is visible and settles. [p.73]
Q3. 10 g of salt is dissolved in 90 g of water. What is the mass by mass percentage of salt?
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Answer: 10 (± 0)
Why: 10 ÷ 100 × 100 = 10%. [p.75]
Why: 10 ÷ 100 × 100 = 10%. [p.75]
Q4. 1 mL of liquid pesticide is mixed with water to make 100 mL of spray. What is its % v/v?
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Answer: 1 (± 0)
Why: 1 ÷ 100 × 100 = 1% v/v. [p.76]
Why: 1 ÷ 100 × 100 = 1% v/v. [p.76]
Q5. A brass alloy is 70% copper by mass. How many grams of copper are in 120 g of brass?
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Answer: 84 (± 0)
Why: 0.7 × 120 = 84 g (zinc 36 g). [p.91]
Why: 0.7 × 120 = 84 g (zinc 36 g). [p.91]
Q6. How can a mixture of acetone (b.p. 56 °C) and water (b.p. 100 °C) be separated?
- Distillation
- Filtration
- Magnetic separation
- Sieving
Show answer
Answer: A. Distillation
Why: Their boiling points differ sufficiently. [p.80–81]
Why: Their boiling points differ sufficiently. [p.80–81]
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Frequently asked questions
How many practice questions are there for Class 9 Science Chapter 5: Exploring Mixtures and their Separation?
55 questions (18 easy, 27 medium, 10 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Science syllabus, used by CBSE and many state boards.