Ncert Exercises & Solutions

9.24 Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:

(i) K[Cr(H₂O)₂(C₂O₄)₂].3H₂O

(ii) [Co(NH₃)₅Cl]Cl₂

(iii) [CrCl₃(py)₃]

(iv) Cs[FeCl₄]

(v) K₄[Mn(CN)₆]

(i) K[Cr(H₂O)₂(C₂O₄)₂].3H₂O

The IUPAC name of the complex is Potassium diaquadioxalatochromate (III) trihydrate.

The oxidation state of chromium = +3
The electronic configuration is 3d³; t_2g³
Coordination number = 6
Stereochemistry: The compound shows both optical and geometrical isomerism. The structures are as follows:

Magnetic moment, µ = \(\sqrt{n(n+2)}\)

\sqrt{= 

The number of unpaired electron(n) = 3}

\sqrt{3 (3 + 2)}

= \sqrt{15}

~ 4 B M

(ii) [Co(NH3)5Cl-]Cl2

IUPAC name: Pentaamminechloridocobalt(III) chloride
Oxidation state of Co = +3
Coordination number = 6 Shape:
octahedral.
Electronic configuration:

d^{6} : {t_{2 g}}^{6}

Stereochemistry:

Magnetic Moment = 0

(iii) [CrCl3(py)3]

IUPAC name: Trichloridotripyridinechromium (III)
Oxidation state of chromium = +3
Electronic configuration for

d^{3} = {t_{2 g}}^{3}

Coordination number = 6 Shape:
octahedral.
Stereochemistry:

Both isomers are optically active. Therefore, a total of 4 isomers exist.'

M a g n e t i c m o m e n t, μ = \sqrt{n (n + 2)}

= \sqrt{3 (3 + 2)}

= \sqrt{15}

~ 4 B M

(iv) Cs[FeCl4]

IUPAC name: Caesium tetrachloroferrate (III)
Oxidation state of Fe = +3
Electronic configuration of

d^{6} = e g^{2} {t_{2 g}}^{3}

Coordination number = 4
Shape: tetrahedral
Stereochemistry: optically inactive Magnetic
moment:

μ = \sqrt{n (n + 2)}

= \sqrt{5 (5 + 2)}

= \sqrt{35} ~ 6 B M

(v) K4[Mn(CN)6]

(v) K4[Mn(CN)6]
Potassium hexacyanomanganate(II)
Oxidation state of manganese = +2
Electronic configuration:

d^{5 +} : {t_{2 g}}^{5}

Coordination number = 6 Shape:
octahedral.

Streochemistry: optically inactive

M a g n e t i c m o m e n t, μ = \sqrt{n (n + 2)}

= \sqrt{1 (1 + 2)}

= \sqrt{3}

= 1.732 B M

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