Is it true that Dalton was unable to explain the concept of isobars and isotopes?

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answer is A.

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Detailed Solution

The given statement is true.

According to Dalton's Atomic Theory,
Atoms of same elements are similar in all respects. Atoms of different elements are different in all respects.
But later it was found that isotopes and iso bars also exist.
Isotopes are the atoms of same element having same atomic number but different mass number.
Isobars are the atoms of different elements which have same mass number but different atomic number.
Therefore, Dalton was unable to explain the concept of isobars and isotopes because he assumed atom as the smallest indivisible particle. He did not know about electrons, protons, and neutrons.

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