1). ) Law of conservation of mass : (Lavoisier and Landolt) . Matter is neither created nor destroyed in the course of chemical reaction though it may change from one form to other . The total mass of materials after a chemical reaction is same as the total mass before reaction. (2) Law of constant or definite proportion : Proust A pure chemical compound always contains the same elements combined together in the fixed ratio of their weights whatever its methods of preparation may be. (3) Law of multiple proportion : Dalton and Berzelius When two elements A and B combine to form more than one chemical compounds then different weights of A, which combine with a fixed weight of B, are in proportion of simple whole numbers. (4) Law of equivalent proportion or law of reciprocal proportion : Ritcher The weights of the two or more elements which separately react with same weight of a third element are also the weights of t
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