CoS (black) obtained in group IV of salt analysis is dissolved in a...

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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
P \( \mathrm{NaHCO}_{3} \) and then \( \mathrm{Br}_{2} \) water. An apple green coloured stable

W. complex is formed. It is :
(a) sodium cobaltocarbonate
(b) sodium cobaltibromide
(c) sodium cobalticarbonate
(d) sodium cobaltobromide
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