The incorrect postulates of the Dalton's atomic theory are :
(A) Atoms of different elements differ in mass.
(B) Matter consists of divisible atoms.
(C) Compounds are formed when atoms of different element combine in a fixed ratio.
(D) All the atoms of given element have different properties including mass.
(E) Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below:
(A) Atoms of different elements differ in mass.
(B) Matter consists of divisible atoms.
(C) Compounds are formed when atoms of different element combine in a fixed ratio.
(D) All the atoms of given element have different properties including mass.
(E) Chemical reactions involve reorganisation of atoms.
Choose the correct answer from the options given below:
- (A)(B), (D), (E) only
- (B)(A), (B), (D) only
- (C)(C), (D), (E) only
- (D)(B), (D) only✓ Correct
Answer: (D)
Solution
Dalton's postulates: atoms are indivisible, and all atoms of a given element are identical in mass and properties. Statement (B) 'matter consists of divisible atoms' contradicts indivisibility, so it is incorrect. Statement (D) 'all atoms of a given element have different properties including mass' contradicts identical atoms, so it is incorrect. (A), (C) and (E) are correct postulates. Hence only (B) and (D) are the incorrect ones.
JEE Main · 2024 · 05 Apr 2024 · Shift 1 · Single correct option