(a) [ Co ( NH_3)_6]^3+ is diamagnetic whereas [ CoF_6]^3- is paramagnetic. Justify the statement. [Atomic number of Co =27 ] (b) Write the electronic…

$\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ is diamagnetic whereas $\displaystyle \left[\mathrm{CoF}_{6}\right]^{3-}$ is paramagnetic. Justify the statement. [Atomic number of $\displaystyle \mathrm{Co}=27$ ]

Write the electronic configuration for $\displaystyle \mathrm{d}^{4}$ ion if $\displaystyle \Delta_{0}>\mathrm{P}$ on the basis of crystal field theory.