EAN of Fe in K₃[Fe(CN)₆] is

1. 34

2. 35

3. 36

4. 47

Which of the following is an oxidizing agent?

(1) $\mathrm{Mn}(\mathrm{CO}{)}_5$                     

(2) $\mathrm{Fe}(\mathrm{CO}{)}_5$

(3) ${\mathrm{Mn}}_2(\mathrm{CO}{)}_{10}$                   

(4) ${\mathrm{Fe}}_2(\mathrm{CO}{)}_9$

Which of the following species can act as reducing agent ?

(1) $\left[\mathrm{Co}\right(\mathrm{CO}{)}_4{]}^{-}$     

(2) $\mathrm{Mn}(\mathrm{CO}{)}_6$       

(3) $\mathrm{Mn}(\mathrm{CO}{)}_5$       

(4) $\mathrm{Cr}(\mathrm{CO}{)}_6$