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

Assertion: The discovery of subatomic particles led to the failure of Dalton’s atomic theory.

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