railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry Basic Concepts of Chemistry
Consider the following postulates of the atomic theory by John Dalton. Identify the correct ones.
- Atoms of various elements exhibit different natures. They do not have similar features.
- By combining in a ratio of the whole number, atoms form the compounds.
- Atoms are never destroyed nor created during any chemical reaction.
1
Only 1 & 2
2
Only 2 & 3
3
Only 1 & 3
4
All 1, 2, 3