Assertion :In the series $S c$ to $Z n$ , the enthalpy of atomisation of zinc is the lowest. Reason: Zinc has greater number of unpaired electrons.

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 C Assertion is correct but Reason is incorrect
$Z n$ $(3 d^{10} 4 s^{2})$ has completely filled d-orbital and has no unpaired electron to take part in the formation of metallic bonds.While other elements in the series do have some unpaired electrons As a result, the metallic bonding in zinc is weakest and it has least enthalpy of atomisation.

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