$(T)$ imparts violet colour $\xrightarrow{compd.\,(U) + conc.\,H_2SO_4}$ $(V)$ Red gas $\xrightarrow{NaOH + AgNO_3}$ $(W)$ Red ppt. $\xrightarrow{NH_3\,soln.}$ $(X)$
$(W)$ Red ppt. $\xrightarrow{dil.\,HCl}$ $(Y)$ white ppt.
$(U)$ $\xrightarrow[\Delta]{NaOH}$ $(Z)$ gas (gives white fumes with $HCl$)?
$(T)$ sublimes on heating
Identify $(T)$ to $(Z).$

• A
  $T = KMnO_4, U = HCl, V = Cl_2, W = HgI_2, X = Hg(NH_2)NO_3, Y = Hg_2Cl_2, Z = N_2$
• B
  $T = K_2Cr_2O_7, U = NH_4Cl, V = CrO_2Cl_2, W = Ag_2CrO_4, X = [Ag(NH_3)_2]^+, Y = AgCl, Z = NH_3$
• C
  $T = K_2CrO_4, U = KCl, V = CrO_2Cl_2, W = HgI_2, X = Na_2CrO_4, Y = BaCO_3, Z = NH_4Cl$
• D
  $T = K_2MnO_4, U = NaCl, V = CrO_3, W = AgNO_2, X = (NH_4)_2CrO_4, Y = CaCO_3, Z = SO_2$