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:
$\ce{K_4[Mn(CN)_6]}$

Answer

$\ce{K_4[Mn(CN)_6]} \ \text{IUPAC}$ name: Potassium hexacyanomanganate $(II)$.
Oxidation state of manganate $= +2$ Electronic configuration of $d^{5+} : t_{2g}^5$ Coordination number $= 6$ Shape:
: octahedral. Stereochemistry: optically inactive Magnetic moment:µ$=\sqrt{\text{n}(\text{n}+2)}$
$=\sqrt{1(1+2)}$
$=\sqrt{3}$
$=1.732$

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