${\mathrm{Mn}}_{\left(\mathrm{aq}\right)}^{2+}$ ion is light pink in colour while ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{4-}$ is blue. Explain.

Which of the following has a larger value of ${\mathrm{\Delta }}_{\mathrm{o}}$?

${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$and ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

Which of the following has a larger value of ${\mathrm{\Delta }}_{\mathrm{o}}$?

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$or ${\left[{\mathrm{CoF}}_6\right]}^{3-}$

Which of the following has a larger value of ${\mathrm{\Delta }}_{\mathrm{o}}$?

${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$