Which of the following is not the postulate of Dalton’s atomic theory of matter

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Each element is made up of extremely small particles called atoms

Atoms cannot be created or destroyed

Atoms of a given element are identical in chemical properties but may have be different physical properties

Compounds are formed by the chemical union of atoms of two or more elements in a fixed proportion which are simple whole number

answer is B.

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Detailed Solution

According to John Dalton’s postulates of atomic theory, all atoms of same kind of element have same physical and chemical properties. But most of the elements can show isotopic property (atoms of element have same no. of protons but the no. of neutrons to be different).

Ex: $_{1}^{1} {H (proton),}_{1}^{2} {H (Duterium),}_{1}^{3} H(Tritium)$ .

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