Question

A pure substance is a substance

• A. that consists of only elements
• B. that is safe to eat
• C. in which all the molecules are similar to one another
• D. that is made up only of atoms

Answer 1

The correct option is C

in which all the molecules are similar to one another

The explanation for the correct answer

(c) in which all the molecules are similar to one another

A pure substance contains only one kind of particle i.e., atoms or molecules. Therefore, pure substance consists of molecules similar to one another

The explanation for the incorrect answer

(a) that consists of only elements

A pure substance is either an element or a compound.

(b) that is safe to eat

A pure substance is not safe to eat because it can be poisonous.

(d) that is made up only of atoms

A pure substance is made up of atoms or molecules.

Hence, the correct option is (c).