Consider the following low-spin complexes The sum of the spin-only magnetic moment values of complexes having yellow colour is _____

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Complex	Colour	Electronic configuration of central metal ion before octahedral splitting	Electronic configuration of central metal ion after octahedral splitting	Number of unpaired electrons (n)	Spin only magnetic moment $(μ) = \sqrt{n (n + 2)}$ BM
$K_{3} [Co {({NO}_{2})}_{6}]$	Yellow	$C o^{3 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$	0	0
$K_{4} [Fe {(CN)}_{6}]$	Yellow	$F e^{2 +} = {}_{18}{[Ar]}$ $3 d^{6}$	$t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$	0	0
$K_{3} [Fe {(CN)}_{6}]$	Red
${Cu}_{2} [Fe {(CN)}_{6}]$	Chocolate brown
${Zn}_{2} [Fe {(CN)}_{6}]$	White