Zinc oxide was produced by the following methods : 0.936 g zinc was dissolved in nitric acid `Zn(NO_3)_2` that is formed on strong heating gave 1.165 g zinc oxide. Show that these results support the law of definite proportion.

Zinc oxide was produced by the following methods : on heating 1.236g of zinc, produced 1.538 g zinc oxide.

0.4 g hydrogen combines with the 3.2 g oxygen to produce water. Hydrogen sulphide is produced by combination of 0.25 g hydrogen and 4.0g sulphur. 1g of sulphur combines with 1 g of oxygen show that the results are in accordance with the law of reciprocal proportion.

1.5 g of each of the two oxides of an element of reduction with hydrogen produced 1.331 g and 1.196g of the element respectively. Show that the result are in agreement with the law of reciprocal proportion.

10 g of KClO_3 ON heating gave enough oxygen to react completely with hydrogen produced by the action of dil H_2SO_4 on zinc. Required for this purpose. [K=39 , Cl=35.5 , Zn=65]