Which of the following statements are correct postulates of Dalton’s atomic theory?
- All matter is made up of atoms. These atoms participate in chemical reactions.
- Atoms might be created or destroyed during a chemical reaction.
- Atoms of different elements vary in mass and chemical properties.
- Compounds are combination of atoms in the ratio of whole or fractional numbers.
- A compound will always have constant relative number and kind of atoms.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. A, C, E .
The correct postulates of Dalton’s atomic theory are:
A. All matter is made up of atoms. These atoms participate in chemical reactions.
C. Atoms of different elements vary in mass and chemical properties.
E. A compound will always have constant relative number and kind of atoms.
These align with Dalton’s original theory, which emphasized that atoms are indivisible particles involved in chemical reactions, different elements have different types of atoms, and compounds are formed by atoms in fixed whole-number ratios.
B is incorrect because Dalton stated atoms cannot be created or destroyed.
D is incorrect as compound ratios are whole numbers, not fractional.