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 :

We need to identify the incorrect postulates of Dalton's atomic theory.

(A) Atoms of different elements differ in mass. This is a correct postulate. ✓

(B) Matter consists of divisible atoms. Dalton stated that atoms are indivisible. So this is an incorrect statement of Dalton's theory. ✗

(C) Compounds are formed when atoms of different elements combine in a fixed ratio. This is a correct postulate. ✓

(D) All the atoms of a given element have different properties including mass. Dalton stated that all atoms of a given element are identical in all properties including mass. So this is an incorrect statement. ✗

(E) Chemical reactions involve reorganisation of atoms. This is a correct postulate. ✓

The incorrect postulates are (B) and (D).

The correct answer is Option (2): (B), (D) only.