Everything we encounter in everyday life is matter. The matter is anything that occupies space and has mass. Matter can be further divided into pure and impure substances based on their composition. A pure substance is made up of only one substance, while an impure substance is made up of two or more substances. Sugar, Water and carbon dioxide are some pure substances, while air, soil and seawater are examples of impure substances.
Download Class 9 Chemistry Worksheet on Chapter 2 Is Matter Around Us Pure Set 3 PDF
CBSE Class 9 Chemistry Chapter 2 Is Matter Around Us Pure Worksheet – Set 3
Q1. The size of colloidal particles ranges between
(a) 10 -7 to 10 -9 cm
(b) 10 -5 to 10 -7 cm
(c ) 10 -11 to 10 -13 cm
(d) 10 -9 to 10 -11 cm
Q2. Which of the following is not a pure substance?
(a) Aerated water
(b) Zinc
(c ) Carbon dioxide
(d) None of the above
Q3. Which of the following is a homogeneous mixture?
(a) Sugar water
(b) Vinegar
(c ) Thumbs up
(d) All of the above
Q4. Isotonic solutions are solutions having the same
(a) Surface tension
(b) Osmotic pressure
(c ) Vapour pressure
(d) None of the above
Q5. Rusting of iron is known as
(a) Corrosion
(b) Dissolution
(c ) Both (a) and (b)
(d) None of the above
Q6. Drying a shirt is a physical or chemical process? Justify your answer.
Q7. What would happen if a saturated solution of potassium chloride was cooled?
Q8. What is the primary difference between colloid and suspension?
Q9. Give an example of a liquid-liquid heterogeneous mixture?
Q10. How can you separate oil and water from their mixture?
Q11. Why can not we see particles of true solution from naked eyes?
Q12. What are colloidal solutions? Enlist its few properties.
Q13. How can you isolate an oil and water mixture?
Q14. Calculate the concentration of 20 g salt in 220 g solution.
Q15. Calculate the amount of salt in a solution containing 0.5 g of salt in 25 g of water.
Q16. (a) Distinguish gold and brass into elements or compounds.
(b) How will you distinguish a chemical process from a physical process?
Q17. Why is a mixture classified as an impure substance?
Q18. Why does the colour of copper sulphate change when an iron nail is kept in it? Justify your answer.
Q19. How will you differentiate between heterogeneous and homogeneous mixtures?
Q20. How will you differentiate between compounds and elements?
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