If nitrogen or sulphur is also present in the compound, the sodium fusion extract is f irst boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium during Lassaigne’s test.
Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with
\(K_4\)[Fe(CN)\(_6\)] is : \[ {Cu}^{2+}, \, {Fe}^{3+}, \, {Ba}^{2+}, \, {Ca}^{2+}, \, {NH}_4^+, \, {Mg}^{2+}, \, {Zn}^{2+} \]
List - I(Test/reagent) | List - II(Radical identified) |
---|---|
(A) Lake Test | (I) NO3− |
(B) Nessler’s Reagent | (II) Fe3+ |
(C) Potassium sulphocyanide | (III) Al3+ |
(D) Brown Ring Test | (IV) NH4+ |
List - ISolid salt treated with dil. H2SO4 | List - IIAnion detected |
---|---|
(A) effervescence of colourless gas | (I) NO2− |
(B) gas with smell of rotten egg | (II) CO32− |
(C) gas with pungent smell | (III) S2− |
(D) brown fumes | (IV) SO23− |