The Question is from neet-chemistry , and it was created by the author P SRAVAN KUMAR

Question

Which law states that a chemical compound always contains the same elements combined together in the same fixed proportion by mass?

P SRAVAN KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Laws of Chemical Combination
 **Related Topics**: Stoichiometry, Chemical formulas, Atomic mass
 **Prerequisites**: Understanding of elements, compounds, and mass ratios.
## SOLUTION PATHWAY
**Given Information**:
The question asks for the law that describes the fixed mass ratio of elements in a compound.
**Method & Steps**:
1. Analyze each law:
    a) Law of Multiple Proportions: This law states that if two elements form more than one compound, the ratios of the masses of the second element that combine with a fixed mass of the first element will be ratios of small whole numbers.  This doesn't directly address the fixed proportion in a *single* compound.
    b) Law of Conservation of Mass: This law states that mass is neither created nor destroyed in a chemical reaction.  It's related but doesn't define the composition of a compound.
    c) Law of Definite Proportions: This law explicitly states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source or method of preparation. This directly answers the question.
    d) Avogadro's Law: This law states that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules. This is unrelated to the composition of a compound.
2. Identify the correct law:
    The Law of Definite Proportions is the only law that directly addresses the fixed mass ratio of elements within a specific compound.
3. Conclusion:
    The Law of Definite Proportions accurately describes the consistent elemental composition of a chemical compound by mass.
**Result**: The correct answer is the Law of Definite Proportions (Option C).
**Verification**: The definition of the Law of Definite Proportions perfectly matches the question's description.
## OPTION ANALYSIS
A :x: The Law of Multiple Proportions describes the ratios of masses when elements form multiple compounds, not the fixed ratio within a single compound.
B :x: The Law of Conservation of Mass deals with the overall mass in a reaction, not the composition of a compound.
C ✓: The Law of Definite Proportions directly states that the mass ratio of elements in a compound is fixed.
D :x: Avogadro's Law relates gas volume to the number of molecules, not the composition of a compound.
## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the Law of Definite Proportions with the Law of Multiple Proportions:  Remember that definite proportions refer to a single compound, while multiple proportions deal with multiple compounds formed from the same elements.
  2.Failing to understand the scope of each law: Each law describes a specific aspect of chemical reactions and composition; understanding their individual limitations is crucial.
 **Quick Tips**:
  1.Memorize the definitions of the key laws of chemical combination.
  2.Use mnemonics or flashcards to recall the differences between the laws.

P SRAVAN KUMAR · Answer

Law of Multiple Proportions

P SRAVAN KUMAR · Answer

Law of Conservation of Mass

P SRAVAN KUMAR · Answer

The correct Option is "Law of Definite Proportions"

P SRAVAN KUMAR · Answer

Avogadro's Law

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