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VITEEE 2015 Paper

Section: Chemistry

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Question : 55 of 120

Marks: +1, -0

A colourless water soluble solid A on heating gives equimolar quantities of B and C. B gives dense white fumes with HCl and C does so with

\mathrm{NH_3}

. B gives brown precipitate with Nessler’s reagent and C gives white precipitate with nitrates of

\mathrm{Ag}^{+}, \mathrm{Pb}^{+}

\mathrm{Hg}^{+}

. A is

$\mathrm{NH_4Cl}$
$\mathrm{NH_4CO_3}$
$\mathrm{NH_4NO_2}$
$\mathrm{FeSO_4}$

Solution:

\underset{\text{A) colourless}}{\mathrm{NH_4Cl}}

\xrightarrow{\Delta}

\underset{\text{B \& C equimolar quantities}}{\mathrm{NH_3+HCl}}

\underset{\text{B}}{\mathrm{NH_3}}

+ HCl →

\underset{\text{dense white fumes}}{\mathrm{NH_4Cl}}

\mathrm{NH_3}

+

\underset{\text{Nessler's reagent}}{\mathrm{2K_2[HgI_4]}}

+ 3KOH →

\underset{\text{brown ppt.}}{\mathrm{H_2NHg . HgI}}

+ 7KI +

\mathrm{H_2O}

iodine of Million’s base

\underset{\text{C}}{\mathrm{HCl}}

+

\mathrm{MNO_3}

→

\underset{\text{whiteppt.}}{\mathrm{MCl}}

+

\mathrm{HNO_3}

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