Question 7. Which of the following materials fall in the category of a “pure substance”? Chapter 2: is Matter Around Us Pure Science Class 9 solutions are developed for assisting understudies with working on their score and increase knowledge of the subjects. Question 7. Which of the following materials fall in the category of a “pure substance”?Question 8. Identify the solutions among the following mixtures.Question 9. Which of the following will show “Tyndall effect”? is solved by our expert teachers. You can get ncert solutions and notes for class 9 chapter 2 absolutely free. NCERT Solutions for class 9 Science Chapter 2: is Matter Around Us Pure is very essencial for getting good marks in CBSE Board examinations
Question 7. Which of the following materials fall in the category of a “pure substance”?
(a) Ice
(b) Milk
(c) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(f) Mercury
(g) Brick
(h) Wood
(i) Air.
Answer: Out of the above substances only Ice, Iron, Hydrochloric acid, Calcium oxide and Mercury are pure substance.
Question 8. Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air
(d) Coal
(e) Soda water.
Answer: Out of the above mixtures Sea water, Air and Soda water are solution.
Question 9. Which of the following will show “Tyndall effect”?
(a) Salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution.
Answer: Tyndall effect is shown by colloidal solution. Here milk and starch solution are colloids therefore milk and starch solution will show Tyndall effect.
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