Step1 Fe is oxidised ; its oxidation state changes from 0 to +2 Step2 Sb2S3 is being reduced ; oxidation state of Sb changes from +3 to 0. Solution Step1 Fe is oxidised ; its oxidation state changes from 0 to +2 Step2 Sb2S3 is being reduced ; oxidation state of Sb changes from +3 to 0..