`{:([(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(4+)underset("oxidise") overset([S_(2)O_(8)]^(2-))to [(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(5+)),(" ""(Brown)"" ""(Green)"):}`
The magnetic moment of green complex is 1.7 BM and for brown complexes magnetic moment is zero. `(O-O)` is same in all respect in both the complexes. The oxidation state of Co in brown complex and green complex respectively are :

Options

A. `{:(III" "III" and "IV" "III),(""brown"" " "green"):}`
B. `{:(III" "II" and "III" "III),(""brown"" " "green"):}`
C. `{:(III" "III" and "III" "II),(""brown"" " "green"):}`
D. `{:(III" "IV" and "III" "III),(""brown"" " "green"):}`

Answer

A