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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