CaO + H₂O → Ca(OH)₂ . This reaction explains 

Water obtained by different sources has the ratio of weight of oxygen to hydrogen a constant. This explains

When two or more elements combine to form a compound, they combined in a fixed ratio of their weights. This law is

Carbon and oxygen combine to form carbon monoxide and carbon dioxide explains the law

When barium chloride is added to sodium sulphate, the white precipitate formed is 

The weight of one element that seperately combines with a fixed weight of another element bear a simple integral ratios. This law is

Law of definite proportion was proposed by

In the formation of carbon monoxide and carbon dioxide, the weights of oxygen that combine with carbon in the ratio

Zn + CuSO₄ → ZnSO₄ + Cu. This reaction follows the law 

Copper forms cupric oxide and cuprous oxide with oxygen. This explains