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Amongst the following statements, that which was not proposed by Dalton was - (1) All the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass (2) When gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same T & P (3) Matter consists of indivisible atoms (4) Chemical reactions involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction.

1. (1)
2. (2)
3. (3)
4. (4)

Correct answer: (2)

Solution

Option (2) refers to Avogadro's principle, which states that gases combine in simple ratios by volume, a concept not proposed by Dalton. Dalton's atomic theory focused on the nature of atoms and their indivisibility, rather than the behavior of gases.

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