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
Unlike Scandium, Zinc does not have unpaired electrons in the ground state as well as in its common oxidation state.
Enthalpy of atomization depends upon the number of unpaired electrons. Greater the number of unpaired electrons, stronger is the interatomic metallic bonding and higher is the enthalpy of atomization.
Hence, Option "C" is the correct answer

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Assertion :In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest. Reason: Zinc has greater number of unpaired electrons.

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.