Assertion :In Rutherford's gold leaf experiment, most of the $α$ particles passed through the foil. Reason: The entire positive charge and nearly all of the mass of an atom are concentrated in the nucleus.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
In Rutherford's gold leaf experiment, most of the $α$ particles passed through the foil due to most of the space in an atom is empty.
The entire positive charge and nearly all of the mass of an atom are concentrated in the nucleus.
So, both assertion and reason are correct but the reason is not the correct explanation of the assertion.
Hence, option B is correct.

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