question_answer

The brown ring complex compound is formulated as \[[Fe{{({{H}_{2}}O)}_{5}}NO]\,S{{O}_{4}}.\] The oxidation state of iron is [EAMCET 1987; IIT 1987; MP PMT 1994; AIIMS 1997; DCE 2000]

A)                 1             

B)                 2

C)                 3             

D)                 0