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An element X forms the following compounds with chlorine;...

An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the

A.

law of multiple proportions

B.

law of chemical proportions

C.

law of simple proportions

D.

law of conservation of mass

E.

law of definite proportions

Correct answer is A

this question expresses the law of multiple proportions which states that if two elements A and B combine together to form more than one compound, the various masses of element B which combines with a fixed mass of B are in simple whole number ratios. e.g