What are binary and tertiary compounds?

Answer:
A binary compound is a compound that contains two different element (for example; NaCl, Fe2S3, Co3O4).

A tertiary compound is a compound that contains three different elements (for example; CuInS2).

Similarly, a quaternary compound contains four elements (for example; YBaCuO7)

All of these terms are normally only used to describe inorganic compounds.
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