Exercise 2

The coordination compounds have great importance in biological systems. In this context, which of the following statements is incorrect?

The correct order of the magnetic moments (spin only values in $\mathrm{B}.\mathrm{M}.$) of the following is:
(Atomic numbers: $\mathrm{Mn}=25, \mathrm{Fe}=26 \text{and} \mathrm{Co}=27$)
 

The value of the 'spin only' magnetic moment for one of the following configurations is $2.84\mathrm{BM}.$ The correct one is

Consider the complex $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{CO}}_3\right]{\mathrm{ClO}}_4.$ The coordination number, oxidation number, number of $\mathrm{d}-$ electrons and the number of unpaired $\mathrm{d}-$electrons of the metal, respectively, are
 

When ${\mathrm{AgNO}}_3$ is added to a solution of $\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{Cl}}_3,$ the precipitate of $\mathrm{AgCl}$ shows two ionisable chloride ions. This means:

A coordination complex compound of cobalt has molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of
this compound produces three mole ions in an aqueous solution. On reacting this solution with excess of ${\mathrm{AgNO}}_3$ solution, two moles of $\mathrm{AgCl}$ gets precipitated. The ionic formula of this complex would be:

For the square planar complex $\left[\mathrm{M}\right(\mathrm{a}\left)\right(\mathrm{b}\left)\right(\mathrm{c}\left)\right(\mathrm{d}\left)\right]$, (where $\mathrm{M}=$ central metal and $\mathrm{a},\mathrm{b},\mathrm{c}$ and $\mathrm{d}$ are monodentate ligands) number of possible geometrical isomers are:

Among $\mathrm{Ni}(\mathrm{CO}{)}_4,{\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$ and $\left[{\mathrm{NiCl}}_4^{2-}\right]$