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Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Atoms and Molecules" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science
Q. The law of constant proportions was proposed by:
- a)Proust
- b)Dalton
- c)Preistley
- d)Ritcher
Correct answer is option 'A'. Can you explain this answer?
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The law of constant proportion was given by Joseph Proust in 1779. This observation was first made by the English theologian and chemist Joseph Priestley, and Antoine Lavoisier, a French nobleman and chemist centered on the process of combustion.
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Given ans is wrong.
RIGHT ANSWER :- Joseph Proust.
RIGHT ANSWER :- Joseph Proust.
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The law of constant proportions was proposed by:
The correct answer is option 'A' - Proust.
Explanation:
The law of constant proportions, also known as the law of definite proportions, was proposed by Joseph Louis Proust, a French chemist, in the late 18th century. This law states that a pure chemical compound always contains the same elements in the same proportion by mass.
Key points:
- Law of constant proportions: The law of constant proportions states that in a chemical compound, the elements are always present in fixed proportions by mass.
- Joseph Louis Proust: Proust was a French chemist who conducted extensive experiments and observations to establish the law of constant proportions.
- Definition of the law: According to the law of constant proportions, the ratio of the masses of the elements present in a compound is always constant, regardless of the source or method of preparation of the compound.
- Example: For example, water (H2O) always consists of two hydrogen atoms and one oxygen atom in a fixed ratio of 2:1 by mass. No matter how water is produced or obtained, this ratio remains constant.
- Implications of the law: The law of constant proportions is a fundamental principle in chemistry as it helps in identifying and characterizing different compounds based on their elemental composition.
- Supporting atomic theory: The law of constant proportions provided evidence in support of John Dalton's atomic theory, which proposed that elements combine in fixed ratios to form compounds.
In conclusion, the law of constant proportions was proposed by Joseph Louis Proust. This law states that a pure chemical compound always contains the same elements in the same proportion by mass, regardless of the source or method of preparation of the compound. It is a fundamental principle in chemistry and supports Dalton's atomic theory.
The correct answer is option 'A' - Proust.
Explanation:
The law of constant proportions, also known as the law of definite proportions, was proposed by Joseph Louis Proust, a French chemist, in the late 18th century. This law states that a pure chemical compound always contains the same elements in the same proportion by mass.
Key points:
- Law of constant proportions: The law of constant proportions states that in a chemical compound, the elements are always present in fixed proportions by mass.
- Joseph Louis Proust: Proust was a French chemist who conducted extensive experiments and observations to establish the law of constant proportions.
- Definition of the law: According to the law of constant proportions, the ratio of the masses of the elements present in a compound is always constant, regardless of the source or method of preparation of the compound.
- Example: For example, water (H2O) always consists of two hydrogen atoms and one oxygen atom in a fixed ratio of 2:1 by mass. No matter how water is produced or obtained, this ratio remains constant.
- Implications of the law: The law of constant proportions is a fundamental principle in chemistry as it helps in identifying and characterizing different compounds based on their elemental composition.
- Supporting atomic theory: The law of constant proportions provided evidence in support of John Dalton's atomic theory, which proposed that elements combine in fixed ratios to form compounds.
In conclusion, the law of constant proportions was proposed by Joseph Louis Proust. This law states that a pure chemical compound always contains the same elements in the same proportion by mass, regardless of the source or method of preparation of the compound. It is a fundamental principle in chemistry and supports Dalton's atomic theory.
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Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Atoms and Molecules" are available for CBSE Class 9Science and have been compiled as per the syllabus of CBSE Class 9ScienceQ. The law of constant proportions was proposed by:a)Proustb)Daltonc)Preistleyd)RitcherCorrect answer is option 'A'. Can you explain this answer?
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