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Question

Law of constant composition is same as the law of:

A
conservation of mass
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B
conversation of energy
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C
multiple proportion
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D
definite proportion
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Solution

The correct option is D definite proportion
The law of constant composition is not the same as the law of conversation of mass or the law of conservation of energy, as these are related to the mass and energy of a system. It is also not related to the law of multiple proportions, which applies when two or more elements/ compounds have multiple ways of combining into different compounds.
The Law of Constant Composition, discovered by Joseph Proust, is also known as the Law of Definite Proportions.
According to the law of constant composition - "A chemical compound always contains its component element in the fixed ratio by mass." Hence option D is correct.

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