(T) Imparts violet colour in the flame test

$\stackrel{\mathrm{compd}\left(\mathrm{U}\right)+\mathrm{conc}\cdot {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }$ $(\mathrm{V}{)}_{\text{Red gas }}$ $\stackrel{\mathrm{NaOH}+{\mathrm{AgNO}}_3}{\to }$

                                              $(\mathrm{W}{)}_{\text{Red ppt }}$$\stackrel{{\mathrm{NH}}_3\text{ soln. }}{\to }$$\left(\mathrm{X}\right)$

$(\mathrm{W}{)}_{\text{Red ppt }}$$\stackrel{\text{ dit. }\mathrm{HCl}}{\to }$ $(\mathrm{Y}{)}_{\text{White }}\mathrm{ppt}$

(U) Sublimes on heating $\underset{\mathrm{\Delta }}{\stackrel{\mathrm{NaOH}}{⟶}}(\mathrm{Z}{)}_{\mathrm{gan}}$  

Identify (T) to (Z).

The reactions are,

$\underset{\left(\mathrm{T}\right)}{{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}}+6{\mathrm{H}}^{+}+4{\mathrm{NH}}_4\mathrm{Cl}\to 2{\mathrm{CrO}}_2{\mathrm{Cl}}_2+4{\mathrm{NH}}_4+3{\mathrm{H}}_2\mathrm{O}$

${\mathrm{CrO}}_2{\mathrm{Cl}}_2+2\mathrm{NaOH}\to {\mathrm{Na}}_2{\mathrm{CrO}}_4+2\mathrm{HCl}$

$$\begin{gathered} {\mathrm{Na}}_2{\mathrm{CrO}}_4+2{\mathrm{AgNO}}_3\to {\mathrm{AgCrO}}_4+2{\mathrm{NaNO}}_3 \\ \left(\mathrm{W}\right) \end{gathered}$$

$$\begin{gathered} {\mathrm{Ag}}_2{\mathrm{CrO}}_4+4{\mathrm{NH}}_3\to 2{\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}+{\mathrm{CrO}}_4^{2-} \\ \left(\mathrm{W}\right) \left(\mathrm{X}\right) \end{gathered}$$

$$\begin{gathered} {\mathrm{Ag}}_2{\mathrm{CrO}}_4+2\mathrm{HCl}\to 2\mathrm{AgCl}\downarrow +2{\mathrm{H}}^{+}+{\mathrm{CrO}}_4^{2-} \\ \left(\mathrm{Y}\right) \end{gathered}$$

$$\begin{gathered} {\mathrm{NH}}_4\mathrm{Cl}+\mathrm{NaOH}\to {\mathrm{NH}}_3\uparrow +\mathrm{NaCl}+{\mathrm{H}}_2\mathrm{O} \\ \left(\mathrm{U}\right) \left(\mathrm{Z}\right) \end{gathered}$$