What happens when ? (a)To a Zn^(2+) io...

What happens when ?
(a)To a `Zn^(2+)` ions solution faintly acidified with `2M` acetic acid, `0.1 mL` of `0.25 M CuSO_(4)` solution and `2 mL` of ammonium tetrathiocyanatomercurate `(II)` reagents is added.
(b) The above test is performed in absence of `CuSO_(4)` solution.

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The correct Answer is:

(a)violet (or blackish-purple ) precipitate consisting of `Zn[Hg(SCN)_(4)]` and `Cu[Hg(SCN)_(4)]` is formed.
(b)`Zn^(2+) + [Hg(SCN)_(4)]^(2-) to Zn[Hg(SCN)_(4)]darr` (white)

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What happens when ?
(a)To a `Zn^(2+)` ions solution faintly acidified with `2M` acetic acid, `0.1 mL` of `0.25 M CuSO_(4)` solution and `2 mL` of ammonium tetrathiocyanatomercurate `(II)` reagents is added.
(b) The above test is performed in absence of `CuSO_(4)` solution.

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RESONANCE-QUALITATIVE ANALYSIS PART 1-EXERCISE 2

What happens when ? (a)To a `Zn^(2+)` ions solution faintly acidified with `2M` acetic acid, `0.1 mL` of `0.25 M CuSO_(4)` solution and `2 mL` of ammonium tetrathiocyanatomercurate `(II)` reagents is added. (b) The above test is performed in absence of `CuSO_(4)` solution.

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RESONANCE-QUALITATIVE ANALYSIS PART 1-EXERCISE 2

What happens when ?
(a)To a `Zn^(2+)` ions solution faintly acidified with `2M` acetic acid, `0.1 mL` of `0.25 M CuSO_(4)` solution and `2 mL` of ammonium tetrathiocyanatomercurate `(II)` reagents is added.
(b) The above test is performed in absence of `CuSO_(4)` solution.