Cobalt sulphide dissolves in aqua regia in the same P manner as nic...

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Cobalt sulphide dissolves in aqua regia in the same
P manner as nickel sulphide. When the aqueous

W solution of the residue obtained after treatment with aqua regia is treated with a strong solution of potassium nitrite after neutralization with ammonium hydroxide and the solution is acidified with dil. acetic acid, a yellow precipitate of the complex is formed which is-
(1) \( \mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{NO}_{2}\right)_{6}\right] \)
(2) \( \mathrm{MnO}(\mathrm{OH})_{2} \)
(3) \( \mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(4) None
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