Amongst the following statements, that which was not proposed by Dalton was:
Some Basic Concepts (Mole Concept) · Class 11 · JEE Main Previous Year Question
Amongst the following statements, that which was not proposed by Dalton was:
- a
Chemical reactions involve reorganization of atoms — neither created nor destroyed.
- b
All atoms of a given element have identical properties including identical mass.
- c✓
When gases combine or are reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at same T & P.
- d
Matter consists of indivisible atoms.
When gases combine or are reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at same T & P.
🧠 Dalton was an "atom-mass" guy, not a "volume" guy Dalton's 1808 theory only spoke about atoms and masses. The "simple ratio by volume" idea is Gay-Lussac's law — Dalton actually rejected it because it didn't fit his picture.
🗺️ Per-option check (a) "Reorganization of atoms" — Dalton's. Correct. (b) "All atoms of an element have identical mass" — Dalton's (isotopes weren't known yet). Correct. (c) "Gases combine in simple volume ratios at same T and P" — Gay-Lussac, not Dalton. This is the answer. (d) "Matter consists of indivisible atoms" — Dalton's. Correct.
⚠️ The Dalton vs Gay-Lussac trap Whenever the word "volume" shows up in an old-chemistry-history option, that's Gay-Lussac. Dalton stayed with masses.
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