Which of the following material 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.
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Answer:
a, c, d, e and f,
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(b) Milk , (c) Iron and (f) Mercury
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