Question

Which of the following is a postulate of Dalton's atomic theory?

• A. All matter consists of indivisible particles called atoms.
• B. The atom is the smallest unit of matter that can take part in a chemical reaction.
• C. Atoms of the same element can combine in the same ratio to form compounds.
• D. All of the above

Answer 1

Answer: (D)

Postulates of Dalton's atomic theory:

(i) All matter consists of indivisible particles called atoms.

(ii) Atoms of the same element are similar in shape and mass but differ from the atoms of the other elements.

(iii) Atoms can not be created or destroyed.

(iv) Atoms of different elements may combine in a fixed simple whole-number ratio to form compound atoms.

(v) Atoms of the same element can combine in the same ratio to form compounds.

(vi) Atoms are the smallest unit of matter that can take part in a chemical reaction.

So, option $D$ is correct.