Assertion : ${Z n}^{2 +}$ is diamagnetic. Reason: The electrons are lost from $4 s$ -orbital to form ${Z n}^{2 +}$ .

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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Assertion is incorrect but Reason are correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
$Z n = [A r] {3 d}^{10} {4 s}^{2}$
In +2 oxidation state, the electron configuration is ${Z n}^{2 +} = [A r] {3 d}^{10}$ . With no unpaired electrons, it is diamagnetic in nature.

Both statements are correct and statement-II is the correct explanation for Statement-I.

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