Assertion :Octet rule is obeyed in the formation of sodium chloride. Reason: According to octet rule, the sodium atom which has only single electron in outermost shell , looses the electron to get a stable configuration like Ne gas, while the chlorine gas with 7 valence electrons gains an electron from the Na atom to obtain an stable configuration like Ar gas.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
According to octet rule, the sodium atom which has only single electron in outermost shell , looses the electron to get a stable configuration like $N e$ gas, while the chlorine gas with $7$ valence electrons gains an electron from the $N a$ atom to obtain an stable configuration like $A r$ gas.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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