NCERT Ex Q7 - Is Matter Around Us Pure?
Question: 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: Pure substances: Ice, Iron, Hydrochloric acid, Calcium oxide, Mercury.
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