Solution:
The yellow filtrate is sodium chromate and the yellow is due to ion. This filtrate is obtained when Cr (III) oxidizes in the presence of sodium peroxide. Brown residue corresponds to Fe(OH)3.
An aqueous solution of and chrome alum is heated with excess of Na2O2 and filtered. The materials obtained are
The yellow filtrate is sodium chromate and the yellow is due to ion. This filtrate is obtained when Cr (III) oxidizes in the presence of sodium peroxide. Brown residue corresponds to Fe(OH)3.