The complex that violates the Sidgwick's rule | vedclass

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(C) The $EAN$ (Effective Atomic Number) rule states that the metal ion in a complex tends to achieve the electronic configuration of the next noble ga

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Tetramine copper $(II)$ sulphate

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(C) The $EAN$ (Effective Atomic Number) rule states that the metal ion in a complex tends to achieve the electronic configuration of the next noble gas ($EAN = 36$ for $3d$ series metals).Calculation of $EAN$ for the given complexes:$1$. $K_4[Fe(CN)_6]: EAN = 26 - 2 + (6 	imes 2) = 36$$2$. $[Co(NH_3)_6]Cl_3: EAN = 27 - 3 + (6 	imes 2) = 36$$3$. $[Cu(NH_3)_4]SO_4: EAN = 29 - 2 + (4 	imes 2) = 35$$4$. $K_3[Co(Cl)_2(C_2O_4)_2]: EAN = 27 - 3 + (2 	imes 2) + (2 	imes 4) = 36$Since the $EAN$ of $[Cu(NH_3)_4]SO_4$ is $35$,it violates the $EAN$ rule.

The complex that violates the Sidgwick's rule of $EAN$ is

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