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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

NCERT Class 9th Science Ch 2 Is Matter Around Us Pure


The following materials fall in the category of a "pure substance" :-

(a) Ice.
(c) Iron.
(d) Hydrochloric acid.
(e) Calcium oxide.
(f) Mercury.
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Pure substances refer to those substances which contain only the same kind of particles.

So, the pure substances from the given list are:

(a) Ice
(c) Iron
(d) Hydrochloric Acid
(e) Calcium Oxide
(f) Mercury
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