If the hydroxy compound is acidic, it will be written in the form H x XO y . Group 1 and Group 2. Boron oxide is giant covalent and is acidic. Carbon monoxide is molecular and is considered to be neutral. Silicon dioxide is giant covalent , containing single Si-O bonds.
Lead monoxide is an ionic solid whose colour varies from yellow to orange.
It is red when hot and turns back to yellow on cooling. On warming, these substances give off chlorine gas. Phosphorus, sulphur amd chlorine. All form molecular oxides which are acidic. They react with water to give the weak acid H 3 PO 3 with p K 1 2.0, and the slightly stronger acid, H 3 PO 4 with p K 1 1.49.