Different proportions of oxygen in the various oxides of nitrogen prove the

The percentage of copper and oxygen in samples of $CuO$ obtained by different methods were found to be the same. This illustrates the law of

In the reaction $N_2 + 3H_2 \rightarrow 2NH_3$,the ratio of volumes of $N_2$,$H_2$,and $NH_3$ is $1 : 3 : 2$. This illustrates which law?

Match the laws given in List-$A$ with the scientists who discovered them in List-$B$.

List-$A$	List-$B$
$(1)$ Law of Multiple Proportions	$(A)$ Dalton
$(2)$ Law of Conservation of Mass	$(B)$ Joseph Proust
$(3)$ Law of Definite Proportions	$(C)$ Lavoisier
	$(D)$ Hofmann

After a chemical reaction,the total mass of reactants and products

One part of an element $A$ combines with two parts of another element $B$. Six parts of the element $C$ combine with four parts of the element $B$. If $A$ and $C$ combine together,the ratio of their weights will be governed by