Assertion : A future discovery of sub atomic particles led to the failure of Dalton’s atomic theory.

Reason : An atom is made up of protons, neutrons and electrons.

Assertion and reason are correct, but Reason is not the correct explanation

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Assertion and reason are correct, and Reason is the correct explanation

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Assertion and reason both are wrong

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Assertion is wrong, but the reason is correct

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Solution

The correct option is B
Assertion and reason are correct, and Reason is the correct explanation

One of the postulates of Dalton's atomic theory was that 'atoms are indivisible and indestructible'. A future discovery of sub atomic particles led to the failure of Dalton’s atomic theory as an atom can be further subdivided into protons, neutrons and electrons.

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Assertion : A future discovery of sub atomic particles led to the failure of Dalton’s atomic theory. Reason : An atom is made up of protons, neutrons and electrons.

Assertion : A future discovery of sub atomic particles led to the failure of Dalton’s atomic theory.

Reason : An atom is made up of protons, neutrons and electrons.