Dalton's theory failed to explain:

A. Law of definite proportions A.

B. Law of conservation of mass B.

C. Existence of isotopes C.

D. Combination of gases D.

Correct Answer: C সঠিক উত্তর: C

Explanation ব্যাখ্যা

Dalton’s Atomic Theory stated that:
All atoms of a given element are identical in mass and properties.
However, isotopes are atoms of the same element with the same atomic number but different mass numbers (e.g., Carbon-12 and Carbon-14). This directly contradicts Dalton’s postulate.
So, Dalton's theory failed to explain the existence of isotopes.

Practice MCQ for SSC, UPSC, RRB Exams

Correct Answer: C সঠিক উত্তর: C

Explanation ব্যাখ্যা

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