1.

{:([(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 :

Answer»

`{:(III" "III" and "IV" "III),(""BROWN""""GREEN"):}`
`{:(III" "II" and "III" "III),(""brown""""green"):}`
`{:(III" "III" and "III" "II),(""brown""""green"):}`
`{:(III" "IV" and "III" "III),(""brown""""green"):}`

ANSWER :A


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