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Question
Which one of the following pairs has only paramagnetic species?
Options
[Cu(NH3)4]Cl2 and O2
[Cu(NH3)4]Cl2 and N2
[Zn(HiO)6]Cl2 and O2
[Cu(NH3)4]Cl2 and K4[Fe(CN)6]
MCQ
Solution
[Cu(NH3)4]Cl2 and O2
Explanation:
Cu2+ : Contain one unpaired e–; paramagnetic
O2 : Two unpaired e–; Paramagnetic
N2 : Nounpairede-; Diamagnetic
Zn2+ : No unpaired e–; Diamagnetic
Fe2+ : Four unpared e
CN– is strong field ligand so, it causes pairing of electrons, hence, K4[Fe(CN)6] is diamagnetic.
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