Which of the following pairs of complexes hav | vedclass

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(D) The $EAN$ (Effective Atomic Number) is calculated as: $EAN = Z - 	ext{oxidation state} + 2 	imes 	ext{coordination number}$.For option $A$:$[Cu

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(D) The $EAN$ (Effective Atomic Number) is calculated as: $EAN = Z - 	ext{oxidation state} + 2 	imes 	ext{coordination number}$.For option $A$:$[Cu(NH_3)_4]SO_4$: $Cu$ is $+2$,$CN=4$. $EAN = 29 - 2 + (2 	imes 4) = 35$.$K_3[Fe(CN)_6]$: $Fe$ is $+3$,$CN=6$. $EAN = 26 - 3 + (2 	imes 6) = 35$.Both have $EAN = 35$.For option $B$:$K_4[Fe(CN)_6]$: $Fe$ is $+2$,$CN=6$. $EAN = 26 - 2 + (2 	imes 6) = 36$.$[Co(NH_3)_6]Cl_3$: $Co$ is $+3$,$CN=6$. $EAN = 27 - 3 + (2 	imes 6) = 36$.Both have $EAN = 36$.For option $C$:$K_3[Cr(C_2O_4)_3]$: $Cr$ is $+3$,$CN=6$ (bidentate ligand). $EAN = 24 - 3 + (2 	imes 6) = 33$.$[Cr(NH_3)_6]Cl(NO_2)_2$: $Cr$ is $+3$,$CN=6$. $EAN = 24 - 3 + (2 	imes 6) = 33$.Both have $EAN = 33$.Since all pairs have the same $EAN$ for their respective central metal ions,the correct answer is $D$.

Which of the following pairs of complexes have the same $EAN$ of the central metal atoms/ions?

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