Assertion :In the formation of a molecule, only outer shell electrons of atoms take part in chemical combination, also known as valence electrons. Reason: Kernel of atom means positively charged nucleus.

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

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

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Assertion is true statement but Reason is false

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Both Assertion and Reason are false statement.

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Solution

The correct option is B Both Assertion and Reason are true but Reason is not the correct explanation for Assertion
In formation of molecule , valance $e^{-}$ participate as they are most loosely bound.
Kernel means the nucleus and electron except the valance electron.
hence assertion &reason are correct but reason is not the correct explanation for assertion.

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1. Both assertion and reason are true and the reason is the correct explanation of the assertion

2. Both assertion and reason are true but reason is not correct explanation of the assertion

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4. Both assertion and reason are false statements

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