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CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is : 

(A) Sodium cobaltocarbonate 

(B) Sodium cobaltibromide 

(C) Sodium cobalticarbonate 

(D) Sodium cobaltobromide

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(C) Sodium cobalticarbonate

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