Which of these is a pure substance? a. diamond b. salt c. ocean water a a and b b and c all of them

The correct answers are A and B. Diamond and salt are pure substances.

Explanation:

A pure substance is one whose composition does not vary, even if the physical conditions in which it is found change. For example, water has a formula that is H2O and is always the same, which indicates that it is made up of molecules in which there are 2 hydrogen atoms and 1 oxygen atom. If I changed that formula, it would be another different substance.

A pure substance cannot be broken down into other simpler substances using physical methods.

A pure substance has its own or defined characteristic properties.