(A) The complex is $Na_4[Fe(CN)_6]$.$1$. The complex ion is $[Fe(CN)_6]^{4-}$,which carries a $-4$ charge.$2$. To find the oxidation state of $Fe$ $(x

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The complex ion carries $-4$ charge

(A) The complex is $Na_4[Fe(CN)_6]$.$1$. The complex ion is $[Fe(CN)_6]^{4-}$,which carries a $-4$ charge.$2$. To find the oxidation state of $Fe$ $(x)$:$x + 6(-1) = -4$$x - 6 = -4$$x = +2$$3$. The coordination number $(C.N.)$ of $Fe$ is determined by the number of ligands attached,which is $6$ ($CN^-$ is a monodentate ligand).Therefore,the statement that the complex ion carries a $-4$ charge is true.

Class 12 Chemistry Coordination Compounds Basic Terms

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Which among the following statements is true about $Na_4[Fe(CN)_6]$?

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A
The complex ion carries $-4$ charge
B
It is a neutral complex
C
The oxidation state of $Fe$ in this complex is $+6$
D
The $C.N.$ of $Fe$ in this complex is $10$

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Which among the following statements is true about $Na_4[Fe(CN)_6]$?

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Which is the correct match for the complex and the number of chelate rings formed? Complex $-$ No. of Rings

The coordination number and oxidation state of metal $E$ in the complex $[E(en)_2(C_2O_4)]NO_2$ (where $en$ is ethylenediamine) are respectively:

$2.33 \ g$ of compound $X$ (empirical formula $= CoH_{12}N_{4}Cl_{3}$) upon treatment with excess $AgNO_{3}$ solution produces $1.435 \ g$ of a white precipitate. The primary and secondary valences of cobalt in compound $X$,respectively are.[Given,atomic mass : $Co = 59, Cl = 35.5, Ag = 108$]

The name of the ring structure complex compound formed between a metal ion and a polydentate ligand is . . . . . . .

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Which is the correct match for the complex and the number of chelate rings formed?
Complex $-$ No. of Rings

$2.33 \ g$ of compound $X$ (empirical formula $= CoH_{12}N_{4}Cl_{3}$) upon treatment with excess $AgNO_{3}$ solution produces $1.435 \ g$ of a white precipitate. The primary and secondary valences of cobalt in compound $X$,respectively are.
[Given,atomic mass : $Co = 59, Cl = 35.5, Ag = 108$]