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Na + C + N → NaCN

FeSO4 + 2NaOH → Fe(OH)2 + Na2SO4

Fe(OH)2 +2NaCN → Fe(CN)2 + 2NaOH

Fe(CN)2 + 4NaCN → Na4[Fe(CN)6] sodium ferrocyanide

3Na4[Fe(CN)6] + 4Fe3 → Fe4[Fe(CN)6]3 + 12Na+

(Ferric ferrocyanide), Blue colour

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