Is used in the brown ring test for a nitrate

CHEMISTRY · Single correct · ISC · Chemistry · Coordination Compounds · Coordination Compounds

Problem

FeSO4\text{FeSO}_4 is used in the brown ring test for a nitrate. What is the oxidation state of Fe in the compound responsible for the brown colour of the ring? (1) 0 (2) 1 (3) +2 (4) +3

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