Give the oxidation state and co-ordination number of central metal ion in the following complexes respectively :
(P) $K_{3} [Co {(C_{2} O_{4})}_{3}]$ (Q) $cis [Cr (en)_{2} {Cl}_{2}] Cl$
(R) ${({NH}_{4})}_{2} [{CoF}_{4}]$ (R) $[Mn {(H_{2} O)}_{6}] {SO}_{4}$

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$(P) + 2, 6 (Q) + 3, 6 (R) + 2, 4 (S) + 2, 6$

$(P) + 3, 6 (Q) + 3, 6 (R) + 2, 4 (S) + 3, 6$

$(P) + 3, 6 (Q) + 2, 6 (R) + 2, 4 (S) + 2, 6$

$(P) + 3, 6 (Q) + 3, 6 (R) + 2, 4 (S) + 2, 6$

answer is A.

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Detailed Solution

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

$Co (III) : 3 d^{6} : t_{2 g}^{6} e_{g}^{0}$

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

$cis [Cr (e n)_{2} {Cl}_{2}] Cl$

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

$Co (II) : d^{7} : e^{4} t_{2}^{3}$

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

$Mn (II) : d^{5} t_{2 g}^{3} e_{g}^{2}$

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