Question:
The statement related to law of definite proportions is
The statement related to law of definite proportions is
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Law of definite proportions states that a pure chemical compound always contains the same elements in the same fixed proportion by mass.
Updated On: Jun 15, 2026
- The ratio of oxygen in \(\mathrm{H_2O}\) and \(\mathrm{H_2O_2}\) with respect to fixed mass of hydrogen atom is a whole number
- \(\%\) of oxygen in \(\mathrm{H_2O}\) is constant irrespective of the source
- Equal volume of all gases at the same temperature and pressure should contain equal number of molecules
- Matter can neither be created nor destroyed
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The Correct Option is B
Solution and Explanation
Step 1: Recall the law of definite proportions.
The law of definite proportions states that a chemical compound always contains the same elements combined together in the same fixed proportion by mass, irrespective of its source or method of preparation.
Step 2: Analyze the given options.
Option (1):
This statement is related to the law of multiple proportions because it compares two compounds, \(\mathrm{H_2O}\) and \(\mathrm{H_2O_2}\), formed by the same elements in different ratios. Hence, it is incorrect here.
Option (2):
Water always contains hydrogen and oxygen in a fixed mass ratio. Therefore, the percentage of oxygen in water remains constant irrespective of the source. This exactly represents the law of definite proportions.
Option (3):
This statement represents Avogadro's law, not the law of definite proportions.
Option (4):
This statement represents the law of conservation of mass.
Step 3: Final conclusion.
Hence, the correct statement related to the law of definite proportions is
\[ \boxed{\%\text{ of oxygen in }\mathrm{H_2O}\text{ is constant irrespective of the source}} \]
The law of definite proportions states that a chemical compound always contains the same elements combined together in the same fixed proportion by mass, irrespective of its source or method of preparation.
Step 2: Analyze the given options.
Option (1):
This statement is related to the law of multiple proportions because it compares two compounds, \(\mathrm{H_2O}\) and \(\mathrm{H_2O_2}\), formed by the same elements in different ratios. Hence, it is incorrect here.
Option (2):
Water always contains hydrogen and oxygen in a fixed mass ratio. Therefore, the percentage of oxygen in water remains constant irrespective of the source. This exactly represents the law of definite proportions.
Option (3):
This statement represents Avogadro's law, not the law of definite proportions.
Option (4):
This statement represents the law of conservation of mass.
Step 3: Final conclusion.
Hence, the correct statement related to the law of definite proportions is
\[ \boxed{\%\text{ of oxygen in }\mathrm{H_2O}\text{ is constant irrespective of the source}} \]
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