Coordination CompoundHard
Question
The correct increasing order of spin-only magnetic moment values of the complex ions
$\left\lbrack {MnBr}_{4} \right\rbrack^{2 -}(A),\left\lbrack Cu\left( H_{2}O \right)_{6} \right\rbrack^{2 +}(B),\left\lbrack Ni\left( {CN}_{4} \right) \right\rbrack^{2 -}\ (C)$ and $\left\lbrack Ni\left( H_{2}O \right)_{6} \right\rbrack^{2 +}(D)$ is:
Options
A.
A $=$ B $<$ D $<$ C
B.
A $=$ B $<$ D $<$ C
C.
C $=$ D $<$ B $<$ A
D.
C $<$ B $<$ D $<$ A
Solution
${Mn}^{2 +}3{\text{ }d}^{5}n = 5$
$${Cu}^{2 +}3{\text{ }d}^{9}t_{2\text{ }g}^{2,2,2}e_{g}^{2,1}n = 1 $$${Ni}^{2 +}3{\text{ }d}^{8}$ square planar $n = 0$
${Ni}^{2 +}3{\text{ }d}^{8}$ tetrahedral $e^{2,2}t_{2}^{2,1,1}n = 2$
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