Embibe Experts Solutions for Chapter: Theoretical Principles of Experimental Chemistry, Exercise 1: Exercise 1

Reaction of $\mathrm{NaCl}$ with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ liberates a gas $\mathrm{X}$ that turns moist blue litmus paper red. When gas $\mathrm{X}$ is passed into a test tube containing egg shell powder suspended in water another gas, $\mathrm{Y}$ is generated which when passed through lime water makes it milky. The gases $\mathrm{X}$ and $\mathrm{Y}$ respectively, are

The gas produced from thermal decomposition of ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is

A hydrated salt of a bivalent metal when heated strongly produces a mixture of gases which when bubbled through $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2$ solution produces a white solid. This solid on treatment with dilute $\mathrm{HCl}$ dissolves a part of the solid leaving another part insoluble which is filtered. The filtrate on treatment with ${\mathrm{Br}}_2$ water slowly precipitates another white solid, which is not soluble in $\mathrm{HCl}$. The gas mixtures are -

Oxalic acid when treated with potassium permanganate in the presence of an acid, produces

When heated in air, brown copper powder turns black. This black powder would then turn brown again when heated with:

When $\mathrm{Co}\left(\mathrm{II}\right)$ chloride is dissolved in concentrated $\mathrm{HCl}$ a blue solution is obtained. Upon dilution with water. The color changes to pink because

Aqueous solution of metallic nitrate $\mathrm{X}$ reacts with ${\mathrm{NH}}_4\mathrm{OH}$ to form $\mathrm{Y}$, which dissolves in excess ${\mathrm{NH}}_4\mathrm{OH}$. The resulting complex is reduced by acetaldehyde to deposit the metal. $\mathrm{X}$ and $\mathrm{Y}$, respectively are:

When ${\mathrm{H}}_2\mathrm{S}$ gas is passed through a hot acidic aqueous solution containing ${\mathrm{Al}}^{3+}, {\mathrm{Cu}}^{2+}, {\mathrm{Pb}}^{2+}$ and ${\mathrm{Ni}}^{2+}$, a precipitate is formed which consists of: