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Chemistry Question on Molecular Orbital Theory

The number of paramagnetic species from the following is ________
[Ni(CN)4]2−⋅[Ni(CO)4],[NiCl4]2−{\left[ Ni ( CN )_4\right]^{2-} \cdot\left[ Ni ( CO )_4\right],\left[ NiCl _4\right]^{2-}} [Fe(CN)6]4−,[Cu(NH3)4]2+ {\left[ Fe ( CN )_6\right]^{4-},\left[ Cu \left( NH _3\right)_4\right]^{2+}} [Fe(CN)6]3− and [Fe(H2O)6]2+ {\left[ Fe ( CN )_6\right]^{3-} \text { and }\left[ Fe \left( H _2 O \right)_6\right]^{2+}}

Answer

The correct answer is 4.
The number of paramagnetic species

[Cu(NH 3​)4​]+2:Cu +2⇒ one unpaired electron : paramagnetic

The number of paramagnetic species