Analytical ChemistryHard
Question
An aqueous solution of salt containing an acidic radical X- reacts with sodium hypochlorite in neutral medium. The gas evolved produces blue black colour spot on the starch paper. The anion X- is :
Options
A.CH3COO-
B.Br-
C.I-
D.NO2-
Solution
OCl- + 3I- + H2O → I3- + 2OH- + Cl-.
I3- + starch → blue -black spot on starch paper due to the formation of iodine-starch adsorption complex.
I3- + starch → blue -black spot on starch paper due to the formation of iodine-starch adsorption complex.
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
What product is formed by mixing the solution of K4 [Fe(CN)6] with the solution of FeCl2 in complete absence of air ?...Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ?...In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydrox...Borax bead test given by :...Original solution of salt or mixture should not be prepared in concentrated HNO3 because it :...