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
Which of the following statements is/are correct ?...Ammonium molybdate test is used for the estimation of :...A metal nitrate solution does not give white precipitate with concentrated hydrochloric acid but on dilution with water ...CoCl2 + KNO2 + CH3COOH → [X] + H2O + KCl + CH3COOK + NO (Unbalenced equation)...Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to...