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Coordination Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryCoordination Chemistry5 Marks
Question
Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereo – chemistry and magnetic moment of the complex.
1. $K \left[ Cr \left( H _2 O \right)_2\left( C _2 O _4\right)_2\right] \cdot 3 H _2 O$
2. $\left[ CO \left( NH _3\right)_5 Cl \right] Cl _2$
3. $CrCl _3( py )_3$
4. $Cs \left[ FeCl _4\right]$
5. $K _4\left[\operatorname{Min}( CN )_6\right]$
✓

Answer

1. Potassium diaquabis (oxalato) chromate (III) trihydrate.
Cordination no. $=6$
Shape $=$ Octahedral
Oxidation state of $Cr = x +0+2(-2)=-1$
(or)
$x-4=-1$
(or)
$x=+3$
Electronic configuration of $Cr ^{3+}=3 d^3= t _{2 g }{ }^3 e _{ g }{ }^0$
No. of unpaired electrons $(n)=3$
Magnetic moment $(\mu)=g \sqrt{n(n+2)}=g \sqrt{3(5)}=g \sqrt{15} BM =3.87 BM$
2. Pentaamminechloro cobalt (III) chloride Cordination no. of $CO =6$
Shape $=$ Octahedral Oxidation state of $CO = x +0-1=+2$
(or)
$x=+3$
Electronic configuration of $CO ^{3+}=3 d ^6= t _{2 g }{ }^6 e _{ g }{ }^0$
$n =0$
Magnetic moment $(p)=0$
3. Trichlorotripyridine chromium (III), Cordination no, of $Cr =6$
Shape $=$ Octahedral Oxidation state of $Cr = x -3+0=0$
$x=+3$
Electronic configuration of $Cr ^{3+}=3 d ^3= t _{2 g }{ }^3 e _{ g }{ }^0$
$n =3$
Magnetic moment $(\mu)=g \sqrt{n(n+2)}=g \sqrt{3(5)}=g \sqrt{15} BM =3.87 BM$
4. Caesium tetrachloroferrate (III), Cordination no. of $Fe =4$
Shape $=$ Tetrahedral Oxidation state of $Fe = x -4=-1$
$x =+3$
Electronic configuration of $Fe ^{3+}=3 d ^5= e ^2 t _2{ }^3$
$n =5$
$(\mu)=g \sqrt{5(5+2)}=g \sqrt{3(5)}=5.92 BM$
5. Potassium hexacyanomanganate (II), Cordination no. of $Mn =6$
Shape $=$ Octahedral Oxidation state of $M n=x-6=-4$
$x =+2$
Electronic configuration of $Mn ^{2+}=3 d ^5= t _{2 g }{ }^5 e _{ g }{ }^0$
$n =1$
$(\mu)=g \sqrt{1(1+2)}=g \sqrt{3} BM =1.73 BM$

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