Embibe Experts Solutions for Chapter: Qualitative Analysis, Exercise 1: Exercise 1

Which of the following solids are soluble in excess of sodium cyanide

$\mathrm{KI}$ solution identifies

An inorganic lewis acid $\left[\mathrm{X}\right]$ gives gelatinous white ppt. With ${\mathrm{NH}}_4\mathrm{OH}$ in presence of ${\mathrm{NH}}_4\mathrm{Cl}$. $\left[\mathrm{X}\right]$ will respond to which of the following characteristics

Which of the following ions can be separated by using ${\mathrm{NH}}_4\mathrm{Cl}$ and ${\mathrm{NH}}_4\mathrm{OH}$

A metal sulphide $\underset{{\mathrm{H}}_2\mathrm{S}}{\overset{\mathrm{HCl}}{\to }}\mathrm{Black} \mathrm{ppt}\stackrel{\mathrm{YAS}}{\to }\underset{\stackrel{\downarrow \mathrm{Aqua}-\mathrm{regia}}{\mathrm{Soluble}}}{\mathrm{Residue}}\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{\mathrm{dil}.}{\to }}\mathrm{Insoluble}$

The true statement(s) about the $\mathrm{ppt}$ $X$ is/are

How many metal hydroxides are soluble (or do not precipitate as hydroxide using ${\mathrm{NH}}_4\mathrm{OH}$) in the presence of ammonium chloride in aqueous solution.
$\mathrm{A}\ell \mathrm{C}{\ell }_3,\mathrm{CrC}{\ell }_3,{\mathrm{ZnSO}}_4,{\mathrm{MgSO}}_4,\mathrm{SrC}{\ell }_2,\mathrm{MnC}{\ell }_2,\mathrm{NiC}{\ell }_2$

Out of given aqueous ions, find the number of ions which produce precipitate with dil. $\mathrm{HCl}+{\mathrm{H}}_2 \mathrm{S}$ is ${\mathrm{Cr}}^{3+},{\mathrm{Zn}}^{2+},{\mathrm{Cd}}^{2+},{\mathrm{Hg}}^{2+},{\mathrm{Fe}}^{2+},{\mathrm{Bi}}^{3+},{\mathrm{Pb}}^{2+}$

If the number of colourless species among the following is $x$:

${\mathrm{Sc}}^{3+},{\mathrm{Ti}}^{4+},{\mathrm{V}}^{3+},{\mathrm{Zn}}^{2+},{\mathrm{Mn}}^{2+},{\mathrm{Fe}}^{3+},{\mathrm{Ni}}^{2+},{\mathrm{Cu}}^{2+},{\mathrm{Cr}}^{3+}$

and the number of amphoteric species amongst the following is $y$:

${\mathrm{Mn}}_2{\mathrm{O}}_7,{\mathrm{CrO}}_3,{ \mathrm{V}}_2{\mathrm{O}}_5,{ \mathrm{V}}_2{\mathrm{O}}_4,{ \mathrm{V}}_2{\mathrm{O}}_3,\mathrm{CrO},{\mathrm{Fe}}_2{\mathrm{O}}_3$ Calculate $\mathrm{x}+\mathrm{y}$.