Give the oxidation state and co-ordination number of central metal ion in the following complexes respectively :

(P) ${\mathrm{K}}_3\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]$  (Q) $\mathrm{cis}\left[\mathrm{Cr}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]\mathrm{Cl}$

(R) ${\left({\mathrm{NH}}_4\right)}_2\left[{\mathrm{CoF}}_4\right]$    (R)  $\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4$

1) State of oxidation: +3. Number of coordination is 6.

$\mathrm{Co} \left(\text{ III }\right):3{\mathrm{d}}^6:{\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0$

2) State of oxidation: +3. Number of coordination is 6.

$\mathrm{cis} \left[\mathrm{Cr}(en{)}_2{\mathrm{Cl}}_2\right]\mathrm{Cl}$

3) State of oxidation: +2. Number of coordination is 4.

$\mathrm{Co} \left(\mathrm{II}\right):{\mathrm{d}}^7:{\mathrm{e}}^4{\mathrm{t}}_2^3$

4) State of oxidation = + 2. Number of coordination is 6.

$\mathrm{Mn} \left(\mathrm{II}\right):d^5{\mathrm{t}}_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^2$