Question

Various theories were put forward to study the nature of atom. The main postulates of Dalton's atomic theory are:

• A. Dalton's atomic theory proposed that all matter was composed of atoms.
• B. Dalton's atomic theory proposed that all matter was composed of molecules.
• C. All atoms of an element are identical.
• D. The atoms of different elements vary in size and mass.

Answer 1

Answer: (A), (C), (D)

The correct options are
A Dalton's atomic theory proposed that all matter was composed of atoms.
C The atoms of different elements vary in size and mass.
D All atoms of an element are identical.

The main points of Dalton's atomic theory are:

1. Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed.
2. All atoms of an element are identical.
3. The atoms of different elements vary in size and mass.
4. Compounds are produced through different whole-number combinations of atoms.
5. A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.