Analytical ChemistryHard
Question
Which of the following compound(s) is /are insoluble in excess aqueous sodium hydroxide ?
Options
A.ZnCl2
B.CdCl2
C.AlCl3
D.MnCl2
Solution
(B) Cd2+ + 2OH- → Cd(OH)2 ↓ (white). ; Cd(OH)2 is insoluble in excess reagent.
(D) Mn2+ + 2OH → Mn(OH2) ↓ (white) ; Mn(OH)2 is insoluble in excess reagent but precipitate turns to brown slowly on exposure to air forming hydrated manganese dioxide. ;
2Mn(OH)2↑ + O2 → 2MnO(OH)2 ↓ (brown).
(D) Mn2+ + 2OH → Mn(OH2) ↓ (white) ; Mn(OH)2 is insoluble in excess reagent but precipitate turns to brown slowly on exposure to air forming hydrated manganese dioxide. ;
2Mn(OH)2↑ + O2 → 2MnO(OH)2 ↓ (brown).
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
Cu2+ and Ag+ are both present in the same solution. To precipitate one of the ions and leaves the other in solution, add...Consider the following statements, S1 : precipitate of lead thiosulphate is soluble in excess sodium thiosulphate (Na2S2...White precipitate of AgCl turns to greyish or black when :...Which of the following reagents gives white precipitate with Hg(NO3)2 solution ?...The composition of golden spangles is :...