(C) The reaction with $HCl$ indicates the presence of $Pb^{2+}$,$Ag^+$,or $Hg_2^{2+}$ as they form white chloride precipitates. When $NH_4OH$ is added

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(C) The reaction with $HCl$ indicates the presence of $Pb^{2+}$,$Ag^+$,or $Hg_2^{2+}$ as they form white chloride precipitates. When $NH_4OH$ is added to a mercurous salt $(Hg_2^{2+})$,it undergoes disproportionation to form a black precipitate of metallic mercury $(Hg)$ and amino-mercuric chloride $(Hg(NH_2)Cl)$. The reaction is: $Hg_2^{2+} + 2NH_4OH \to Hg(l) + Hg(NH_2)Cl(s) + NH_4^+ + 2H_2O$. This black precipitate does not dissolve in excess $NH_4OH$.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

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To a solution of a substance,gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of $NH_4OH$. However,when $HCl$ is added to the original solution,a white precipitate is formed. The solution contained

A
Lead salt
B
Silver salt
C
Mercurous salt
D
Copper salt

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Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

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Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as a white precipitate, which is insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z$. $X$, $Y$, and $Z$ respectively are:

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Assign $A$,$B$,$C$,$D$ from the given type of reaction: $NiCl_2 (aq) + NaNO_3 (aq) \longrightarrow$ No reaction.

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On saturating an aqueous solution of $Cu(II)$,$Pb(II)$,and $Zn(II)$ ions with $H_2S$,which of the following will precipitate?

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To a solution of a substance,gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of $NH_4OH$. However,when $HCl$ is added to the original solution,a white precipitate is formed. The solution contained

Similar Questions

Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

Three separate samples of a solution of a single salt gave these test results: one formed a white precipitate with excess ammonia solution,one formed a white precipitate with dilute $NaCl$ solution,and one formed a black precipitate with $H_2S$. The salt could be:

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as a white precipitate, which is insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z$. $X$, $Y$, and $Z$ respectively are:

Assign $A$,$B$,$C$,$D$ from the given type of reaction: $NiCl_2 (aq) + NaNO_3 (aq) \longrightarrow$ No reaction.

On saturating an aqueous solution of $Cu(II)$,$Pb(II)$,and $Zn(II)$ ions with $H_2S$,which of the following will precipitate?

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