The combination of elements to form compounds in a chemical reaction is governed by various basic laws. In option (i) the Law of Conservation of Mass states that matter cannot be created nor destroyed. In the given reaction, there is no net change in the mass, hence the first option is correct.

The second option mentions the Law of Multiple Proportions. The law states that “if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.” This law does not apply here because there is only one product formed.

Considering the third and fourth option, the reaction does not create higher amount of product on excess or decreasing of one product as the reaction proceeds stoichiometrically.

The correct answer is (i).