Assertion: Zn2+ ion is diamagnetic. Reason: The electrons are lost from 4s-orbital to form Zn2+ ion.

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KollegeApply · Accepted Answer

Both Assertion and Reason are CORRECT, but Reason is NOT the correct explanation of the Assertion. Explanation: The Zn2+ ion is diamagnetic because after losing two electrons, it has a completely filled 3d10 subshell, with all electrons paired. Although it is correct that electrons are lost from the 4s orbital, this fact alone does not explain diamagnetism; diamagnetism is due to the absence of unpaired electrons.

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