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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds3 Marks
Question
Write down the $\text{IUPAC}$ name for the following complex and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:
$\ce{CrCl_3(py)_3}$
✓

Answer

$CrCl_3(py)_3$
IUPAC name: Trichloridotripyridinechromium $(III).$
Oxidation state of chromium $= +3$
Electronic configuration for $d^3 = t_{2g}^3$
Coordination number $= 6$
Shape: octahedral.
Stereochemistry:

Both isomers are optically active.
Therefore, a total of $4$ isomers exist.
Magnetic moment, $µ=\sqrt{\text{n}(\text{n}+2)}$
$=\sqrt{3(3+2)}$
$=\sqrt{15}$
$=\sim 4\text{BM}$

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