Analytical ChemistryHard

Question

Which of the following reagents gives white precipitate with Hg(NO3)2 solution ?

Options

A.Cobalt (II) thiocyanate
B.Tin (II) chloride (excess)
C.Ammonia solution
D.Potassium cyanide solution

Solution

(A) Hg2+ + Co2+ + 4SCN- → Co[Hg(SCN)4↓ (deep blue) ;
(B) 2Hg2+ + Sn2+ + 2Cl- →  Hg2Cl2↓ (white) + Sn4+ ;  Hg2Cl2 + Sn2+ →  Hg ↓ (black) + Sn4+ + 2Cl-
(C) 2Hg2+ + NO3- + 4NH3 + H2O → HgO.Hg(NH2)NO3↓ (white)
(D) KCN no effect i.e. no reaction.

Create a free account to view solution

View Solution Free
Topic: Analytical Chemistry·Practice all Analytical Chemistry questions

More Analytical Chemistry Questions

When small amount of SnCl2 is added to a solution of Hg2+ ions, a silky while precipitate is obtained. The silky white p...Nitrite (NO2-) interferes in the ′ring-test′ of nitrate (NO3-). Some of the following reagents can be used f...To increase significantly the concentration of free Zn2+ ion in a solution of the complex ion [Zn(NH3)4]2+ Zn2+ (aq) + 4...Nitrate is confirmed by ring test. The brown colour of the ring is due to formation of :...Precipitate of PbSO4 is soluble in :...