Cu forms two oxides cuprous and cupric oxides, which law can be proved by the weights of Cu and O?

Cu forms two oxides cuprous and cupric oxides, which law can be proved

1.	Cu forms two oxides cuprous and cupric oxides, which law can be proved by the weights of Cu and O?
Answer» CONSTANT composition Multiple proporations Reciprocal PROPORTIONS Definite proportions Answer :B