The chemical used in the brown ring test is A. CuSO4 B. FeSO4 C. Fe2(SO4)3 D. ZnSO4
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The brown ring is formed due to presence of brown coloured double compound nitroso ferrous sulphate Fe(NO)SO4
FeSO4+fromnitratesNO→brownringFe(NO)SO4
When the mixture is shaken or if it gets hot, the complex breaks to form a yellow solution of Fe2(SO4)3.
Hence, the brown colour disappears and NO is evolved.
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