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=Question 1

=Question 2

=Question 3

=Question 4

=Question 5, 6

=Question 7, 8, 9

=Question 10, 11

 

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”?

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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Question 7. Which of the following materials fall in the category of a “pure substance”?

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