The correct statement is; For two compounds of C and O, the mass ratio of C to O in one compound is a multiple of the mass ratio of C to O in the other compound or can be converted to a small whole number ratio.
According to the law of multiple proportions, if two elements say, A and B combine to form more than one chemical compound; the various masses of one element, A, which combine with a fixed mass of the other element B are in simple ratio.
This means that, if there are two compounds of elements like C and O (as in CO and CO2), the mass ratio of C to O in one compound is a multiple of the mass ratio of C to O in the other compound or can be converted to a small whole number ratio.
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