Which one of the following complexes will exhibit the least param… - Vidyadip

MCQ

Which one of the following complexes will exhibit the least paramagnetic behaviour ?
[Atomic number, Cr = 24, Mn = 25, Fe=26, Co=27]

A
$\left[ Co \left( H _2 O \right)_6\right]^{2+}$
B
$\left[ Fe \left( H _2 O \right)_6\right]^{2+}$
C
$\left[ Mn \left( H _2 O \right)_6\right]^{2+}$
D
$\left[ Cr \left( H _2 O \right)_6\right]^{2+}$

✓

Answer

	Number of unpaired e -	mu=sqrt(n(n+2)) B.M.
$\left[ Co \left( H _2 O \right)_6\right]^{2+}$	3	3.87
$\left[ Fe \left( H _2 O \right)_6\right]^{2+}$	4	4.89
$\left[ Mn \left( H _2 O \right)_6\right]^2$	5	5.92
$\left[ Cr \left( H _2 O \right)_6\right]^{2+}$	4	4.89

Least paramagnetic behaviour $=\left[ Co \left( H _2 O \right)_6\right]^{2+}$

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