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

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

Answer 1

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

(a) Ice.
(c) Iron.
(d) Hydrochloric acid.
(e) Calcium oxide.
(f) Mercury.

Answer 2

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