Question

Which one of the following would exhibit the lowest value of paramagnetic behaviour?

• A. $\left[Fe\right(CN{)}_6{]}^{3-}$
• B. $\left[Co\right(CN{)}_6{]}^{3-}$
• C. $\left[Cr\right(CN{)}_6{]}^{3-}$
• D. $\left[Mn\right(CN{)}_6{]}^{3-}$

Answer 1

Answer: (B)

$\left[Co\right(CN{)}_6{]}^{3-}$

$C{O}^{3+}\to d^6$ strong field legand

$tz{g}^{6}e{g}^6\to n=0$(parametric)

$F{e}^{3+}\to d^5\to tz{g}^{5}e{g}^0\to n=1$(paramatric)

so,(B) will be correct answer.