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Question
Which of the following is paramagnetic?
Options
Cu2+
Ag+
Zn2+
Au+
MCQ
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Solution
Cu2+
Explanation:
Paramagnetic substances have unpaired electrons.
Cu2+ has the configuration [Ar] 3d9, which has one unpaired electron, so it is paramagnetic.
Ag+, Zn2+, and Au+ have all paired electrons, so they are diamagnetic.
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