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Option 2 : 2 only
The correct answer is 2 only.
- John Dalton, a British chemist provided the basic theory about the nature of matter.
- His theory was based on the laws of chemical combination.
- Dalton’s atomic theory provided an explanation for the law of conservation of mass and the law of definite proportions.
- Law of Conservation of Mass- Mass is neither created nor destroyed in chemical reactions.
- Law of definite proportions- Every chemical compound contains fixed and constant proportions (by mass) of its constituent elements.
- According to Dalton’s atomic theory all matter is composed of small particles called atoms. The postulates of this theory may be stated as follows:-
- All matter is made of very tiny particles called atoms, which participate in chemical reactions.
- Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. Hence, statement 1 is incorrect.
- Atoms of a given element are identical in mass and chemical properties.
- Atoms of different elements have different masses and chemical properties.
- Atoms combine in the ratio of small whole numbers to form compounds.
- The relative number and kinds of atoms are constant in a given compound. Hence, statement 2 is correct.
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