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CGP EDU Academic Team
Published on: August 14, 2026
In the absence of copper ion, zinc ion form a white precipitate with the ammonium tetrathio-cyanatomercurate(II) How the presence of Cu 2+ ion affect this test ?
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→ Cu 2+ + [Hg(SCN) 4 ] 2– 
Cu[Hg(SCN) 4 ]
* In the presence of the copper ions, the copper complex Co-precipitated with that of zinc complex and colour become violet
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