In the reaction sequence:

${\mathrm{CrCl}}_3\underset{{\mathrm{NH}}_4\mathrm{OH}}{\stackrel{{\mathrm{NH}}_4\mathrm{Cl}}{⟶}}\left(A\right)\stackrel{{\mathrm{Na}}_2{\mathrm{O}}_2\text{ Soln. }}{\to }\left(B\right)\underset{\text{ acetate }}{\stackrel{\text{ Lead }}{⟶}}\left(C\right)$

In this reaction sequence, compound C is :

When chromium chloride is in presence of ammonium chloride and ammonium hydroxide a compound is formed. In the presence of sodium peroxide, another compound is formed. Further the compound reacts with the lead and acetate formed lead chromate is formed.