Which law states that a chemical substance is always made up of the same elements combined in the same fixed proportion...

Type: MCQ • Marks: 1

Which law states that a chemical substance is always made up of the same elements combined in the same fixed proportion by mass?

A. Law of Conservation of Mass

B. Law of Multiple Proportions

C. Gay-Lussac's Law

D. Law of Definite Proportions (Constant Composition)

Explanation

The Law of Definite Proportions was proposed by Joseph Proust, stating fixed mass ratios in compounds.

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Class 9th Science (MCQ)

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