Question
Two oxides of a certain metal were separately heated incurrent of hydrogen until constant weights were obtained.The water produced in each case was carefully collectedand weighed. 2 g of each oxide gave, respectively 0.2517and 0.4526 g of water. This observation illustrates(a) law of conservation of mass(b) law of constant proportions(c) law of multiple proportions(d) law of reciprocal proportions.