A pungent smelling gas A gives dense white fu | vedclass

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(C) Ammonia gas $(NH_3)$ reacts with hydrogen chloride gas $(HCl)$ to form dense white fumes of ammonium chloride $(NH_4Cl)$. This reaction is a chara

Vedclass · Accepted Answer

$NH_3, K_2HgI_4, NH_2Hg_2OI$

Vedclass · Answer

(C) Ammonia gas $(NH_3)$ reacts with hydrogen chloride gas $(HCl)$ to form dense white fumes of ammonium chloride $(NH_4Cl)$. This reaction is a characteristic test for ammonia.$NH_{3(g)} + HCl_{(g)} \longrightarrow NH_4Cl_{(s)}$Nessler's reagent $(B)$ is an alkaline solution of potassium tetraiodomercurate$(II)$,$K_2HgI_4$. When ammonia reacts with Nessler's reagent in an alkaline medium,it forms a reddish-brown precipitate known as the iodide of Millon's base,which has the formula $NH_2Hg_2OI$ (or $HgO \cdot Hg(NH_2)I$).Therefore,$A = NH_3$,$B = K_2HgI_4$,and $C = NH_2Hg_2OI$.

$A$ pungent smelling gas $A$ gives dense white fumes with conc. $HCl$. When $A$ reacts with an alkaline solution of a colourless reagent $B$,a reddish-brown precipitate $C$ is formed. The compounds $A, B, C$ respectively are:

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