Which of the following complex ions does not | vedclass

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(A) $1$. In $[MnO_4]^-$,the oxidation state of $Mn$ is $x + 4(-2) = -1$,so $x = +7$. The electronic configuration of $Mn$ $(Z=25)$ is $[Ar] 3d^5 4s^2$

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$[MnO_4]^-$

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(A) $1$. In $[MnO_4]^-$,the oxidation state of $Mn$ is $x + 4(-2) = -1$,so $x = +7$. The electronic configuration of $Mn$ $(Z=25)$ is $[Ar] 3d^5 4s^2$. Thus,$Mn^{7+}$ is $[Ar] 3d^0 4s^0$. It has no $d$-electrons.$2$. In $[Co(NH_3)_6]^{3+}$,$Co$ is in $+3$ state. $Co$ $(Z=27)$ is $[Ar] 3d^7 4s^2$,so $Co^{3+}$ is $[Ar] 3d^6$. It has $d$-electrons.$3$. In $[Fe(CN)_6]^{3-}$,$Fe$ is in $+3$ state. $Fe$ $(Z=26)$ is $[Ar] 3d^6 4s^2$,so $Fe^{3+}$ is $[Ar] 3d^5$. It has $d$-electrons.$4$. In $[Cr(H_2O)_6]^{3+}$,$Cr$ is in $+3$ state. $Cr$ $(Z=24)$ is $[Ar] 3d^5 4s^1$,so $Cr^{3+}$ is $[Ar] 3d^3$. It has $d$-electrons.Therefore,the correct option is $A$.

Which of the following complex ions does not contain any $d$-electrons in the central metal atom?

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