1.

underset("Brown")([(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(4+)) underset("oxidise")overset([S_(2)O_(8)]^(2-))tounderset("Green")([(NH_(3))_(5)Co-O-O-Co(NH_(3))_(5)]^(+5)) The magnetic moment of green complex is 1.7 BM & for brown complexes magnetic moment is zero. (O-O) is same in all respect in both the complexes. The O.S. of Co in brown complex & green complex respectively are-

Answer»

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

Answer :A


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