Question

Which of the following materials fall in the cato
substance"?
(a)
Ice
(b) Milk
(c) Iron
(d) Hydrochloric acid
(e) Calcium oxide
(1) Mercury
Brick
(h) Wood
(i) Air.​

Answer 1

Answer:

Pure substance is one that does not have any other substance or impurity present in it and cannot be separated into other kinds of matter by physical processes. It can be an element or a compound.

Out of the given nine compounds following are the pure substances

Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition.

Milk is a colloid and acts as a heterogeneous mixture hence is not a pure substance.

Brick and air are made up of more than one substance hence they also don’t fall in the category of pure substances.

Answer 2

Explanation:

Pure substances are defined as substances that are made of only one type of atom or molecule. 

The pure substances are:

(a) Ice 

(c) Iron 

(d) Hydrochloric acid 

(e) Calcium oxide 

(f) Mercury 

Answer by me