Analytical ChemistryHard
Question
Fe(OH)3 and Cr(OH)3 precipitates can be completely separated by :
Options
A.Aq. NH3
B.HCl
C.NaOH/H2O2
D.H2SO4
Solution
Both dissolves in acids. Cr(OH)3 is partially soluble while Fe(OH)3 is not soluble in aqueous NH3. Only Cr(OH)3 not Fe(OH)3 is soluble by NaOH/H2O2 according to the reaction.
Cr(OH)3 ↓ (green)
CrO42- (yellow solution) + H2O.
Cr(OH)3 ↓ (green)
CrO42- (yellow solution) + H2O.Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
Which of the following is a local anesthetic ?...In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydrox...A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B), which when passed through an alkalin...Which of the statements is not true?...Which of the following will give the same colour in oxidising flame as well as in the reducing flame in borax bead test ...