Assertion :To overcome electrostatic force of attraction between electrons and nucleus, they revolve around the nucleus Reason: Mass of the atom is almost due to its 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
The centrifugal force due to revolution overcomes force of attraction. Thus assertion is true. Also the mass of electrons is negligible compared to protons and neutrons, thus almost all mass of atom is present in nucleus. Hence answer is option B as reason does not explain assertion.

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