Question

Amongst the following statements, that which was not proposed by Dalton was:

• A. all the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass.
• B. when gases combine or reproduced in a chemical reaction, they do so in a simple ratio by volume provided all gases are maintained at the same temperature and pressure.
• C. matter consists of indivisible atoms.
• D. chemical reactions involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction.

Answer 1

The correct option is B when gases combine or reproduced in a chemical reaction, they do so in a simple ratio by volume provided all gases are maintained at the same temperature and pressure.

Dalton’s atomic theory proposed that all matter was composed of small particles called atoms. Atoms of given elements are identical in size, mass and other properties but atoms of different elements varies in their size and other properties. Atoms are indivisible, indestructible building blocks. Atoms of different elements combine to form chemical compounds in simple whole-number ratios. In chemical reactions, atoms are rearranged, separated or combined to form product.

When gases combine or react in a chemical reaction they do so in a simple ratio by volume provided all gases are maintained at the same temperature and pressure - Gay-Lussac’s law.