Binary acids hold on to their h's and Oxo don't.

Binary acids are certain molecular compounds in which hydrogen is combined with a second nonmetallic element.

The names of binary acids begin with hydro- followed by the name of the other element modified to end with -ic.

This chemical compound can dissolve in water to form hydroastatic acid, which exhibits properties very similar to the other four binary acids, and is in fact the strongest among them.

In the group of binary compounds of hydrogen a binary acid will include a hydrogen atom attached to another atom that will typically be in the 17th group of the periodic Table.