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Question

Assertion: The 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.

A
Assertion and reason are correct, but reason is not the correct explanation.
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B
Both assertion and reason are correct, and reason is the correct explanation.
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C
Assertion and reason, both are wrong.
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D
Assertion is wrong, but the reason is correct.
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Solution

The correct option is B Both assertion and reason are correct, and reason is the correct explanation.
One of the postulates of Dalton's atomic theory states that 'atoms are indivisible and indestructible'.

The 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.

Hence, both assertion and reason are correct and reason is the correct explanation of assertion.

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