Which of the following materials fall in the category of a "pure substance" ? Question 7 from Chapter 2. IS Matter Around Us Pure ?

(a) Ice

(b) Milk

(c) Iron

(d) Hydrochloric acid

(e) Calcium oxide

(f) Mercury

(g) Brick

(h) Wood

(i) Air.

 Answer : A pure substance contains only one kind of pure matter and its composition is the same throughout. Mixtures are constituted by more than one kind of pure substance.A pure substance cannot be separated into other kinds of matter by any physical process.Whatever the source of a substance may be, it will always have the same characteristic properties. Therefor as per the description of pure substance above, the following materials fall in the category of a “pure substance”:

(a) Ice

(c) Iron

(d) Hydrochloric acid

(e) Calcium oxide

(f) Mercury

This is an answered question from Chapter 2. IS Matter Around Us Pure ? of CBSE Class 9th Science

Check for Complete Exercise Solution for Chapter 2. IS Matter Around Us Pure ? | CBSE Class 9th Science