PtO4 does not exist so no-one knows what the bonding is. PtO2 is known but a full structure determination of the anhydrous compound has not been made but it is believed to have a layer structure similar to that of CdI2 cadmium iodide. In this structure the metal atom is 6 coordinate. Simply termed as ionic it has covalent character.
BO is a molecular compound because it is composed of nonmetals (boron and oxygen) and forms covalent bonds.
Cr is a transition metal element, specifically chromium. It is not considered ionic or molecular on its own.
Cr2O3 is an ionic compound. It consists of chromium ions (Cr3+) and oxide ions (O2-) held together by ionic bonds.
H2O is a molecular compound.
Glucose is a molecular compound, not ionic. It consists of covalent bonds between its carbon, hydrogen, and oxygen atoms.
Ionic Molecular
ionic
Molecular
molecular
PtO2 is ionic
ionic
ionic
it is ionic
It is molecular
It's molecular
A molecular covalent compound
Molecular compound