Single Choice

In Nessler's reagent for the detection of ammonia the active species is:

A$$Hg_2Cl_2$$
B$$Mg^{2+}$$
C$$Hg_2l_2$$
D$$HgI^{2-}_4$$
Correct Answer

Solution

In Nessler's reagent for the detection of ammonia the active species is $$HgI^{2-}_4$$.
Nessler's reagent gives brown ppt. of iodide of Milion's base with ammonium salt.
$$2[Hgl_4]^{2-}+NH_4Cl+4OH^-\rightarrow \underset{ \text {iodide of million's base(brown ppt)}}{NH_2-Hg-O-Hg-l}+7I^-+Cl^- +3H_2O$$.

SIMILAR QUESTIONS

Chemistry Practical

The cation that will not be precipitated by $$H$$_2S$$ in the presence of dil $$HCl$$ is:

Chemistry Practical

A solution containing a group-IV cation gives a precipitate on passing $$H_2S$$. A solution of this precipitate in $$dil.HCl$$ produces a white precipitate with basic $$NaOH$$ solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is:

Chemistry Practical

A reddish-pink substance on.heating gives off a vapor which condenses on the sides of the test tube and the substance turns blue. If on cooling water is added to the residue, it turns to its original color. The substance is :

Chemistry Practical

Reagent used in the qualitative analysis of IVth group is

Chemistry Practical

Group reagent for analytic group $$IV$$ is

Chemistry Practical

Precipitate of group $$IV$$ cations takes place when $$H_2S$$ is

Chemistry Practical

In $$IV$$ group analysis, $$NH_{4}OH$$ is added before passing $$H_{2}S$$ gas because:

Chemistry Practical

Mark the correct statement(s)

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