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.
(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 FreeMore Analytical Chemistry Questions
Which of the following reagents gives a yellow precipitate with a hot faintly acidic solution of Bi3+ ions ?...The reagents, NH4Cl and aqueous NH3 will precipitate :...A solution of colourless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after...Upon treatment with ammonical H2S , the metal ion that precipitates as a sulfide is -...27 g of aluminium react completely with how many grams of oxygen ?...