Q7 of 23 Page 68

Identify the solutions among the following mixtures.

(a) Soil (b) Sea water


(c) Air (d) Coal


(e) Soda water.

Sea water, soda water, air are solutions.


A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent.


More from this chapter

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5

How would you confirm that a colourless liquid given to you is pure water?

 6

Which of the following materials fall in the category of a “pure substance”? Give reasons.

(a) Ice (b) Milk


(c) Iron (d) Hydrochloric acid


(e) Calcium oxide (f) Mercury


(g) Brick (h) Wood


(i) Air

 8

Which of the following will show “Tyndall effect”? How can you demonstrate Tyndall effect in them?

(a) Salt solution


(b) Milk


(c) Copper sulphate solution


(d) Starch solution.

 9

Classify the following into elements, compounds and mixtures.

(a) Sodium (b) Soil


(c) Sugar solution (d) Silver


(e) Calcium carbonate (f) Tin


(g) Silicon (h) Coal


(i) Air (j) Soap


(k) Methane (l) Carbon dioxide


(m) Blood