Page 2 - 4.Home Assignment_Pure and Impure Substances

SUBJECTIVE QUESTIONS

Sl.No. Questions Mark Skill
Q.1 Pure substances are……………………. In nature and composed of 1 Av/U
……………… kind of particles
Q.2 Impure substances do not have a …………… and 1 E/R
………………boundary.
Q.3 Classify the following into pure and impure substances 3 Av/U
Air, iron, common salt, stone, salt solution, brass
Q.4 Give reasons for the following: 3 Av/A
a) Impure substances do not have fixed melting or boiling points.
b) Sugar is considered as a pure substance.
Q.5 a) Write three points of difference between pure and impure 5 Av/A
substances.
b) Name two categories of pure substance and give one example
of each.

NCERT Text Book-Std-IX-Science
Pg. 15 Q.1
Pg. 29 Q.7