Chemistry - Complete d-block Question with Solution | TestHub

Red vapours of$\mathrm{C}\mathrm{r}{\mathrm{O}}_2\mathrm{C}{\mathrm{l}}_2$are obtained.
${\mathrm{K}}_2\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7+2{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to \mathrm{K}\mathrm{H}\mathrm{S}{\mathrm{O}}_4+2\mathrm{C}\mathrm{r}{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$
$\mathrm{K}\mathrm{C}\mathrm{l}+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\to \mathrm{K}\mathrm{H}\mathrm{S}{\mathrm{O}}_4+\mathrm{H}\mathrm{C}\mathrm{l}$
${\text{CrO}}_{\text{3}}\text{+}\text{2HCl}\to \underset{\underset{\left(\text{Red}\text{oily}\text{vapours}\right)}{\text{Chromyl}\text{chloride}}}{{\text{CrO}}_{\text{2}}{\text{Cl}}_{\text{2}}}\text{+}{\text{H}}_{\text{2}}\text{O}$
Note: When these vapours are passed into NaOH solution, yellow colouration is obtained. This yellow solution is acidified with acetic acid. When lead acetate is added to this solution, yellow precipitate of$\mathrm{P}\mathrm{b}\mathrm{C}\mathrm{r}{\mathrm{O}}_4$is obtained.
$\text{4NaOH}\text{+}{\text{CrO}}_{\text{2}}{\text{Cl}}_{\text{2}}\to \underset{\left(\text{Yellow}\text{solution}\right)}{{\text{Na}}_{\text{2}}{\text{CrO}}_{\text{4}}}\text{+}\text{2NaCl}\text{+}{\text{H}}_{\text{2}}\text{O}$
${{\text{(CH}}_{\text{3}}\text{COO)}}_{\text{2}}\text{Pb}\text{+}{\text{Na}}_{\text{2}}{\text{CrO}}_{\text{4}}\to {\text{2CH}}_{\text{3}}\text{COONa}\text{+}\underset{\left(\text{Yellow}\text{ppt}\text{.}\right)}{{\text{PbCrO}}_{\text{4}}}$