The green bead indicates the presence of Fe3+. The number of unpaired electrons in Fe3+ is 5. The spin-only magnetic moment is given by:
\( \mu = \sqrt{n(n + 2)} \, \text{BM} \)
Substituting \( n = 5 \):
\( \mu = \sqrt{5(5 + 2)} = \sqrt{35} \approx 5.92 \, \text{BM} \)
Nearest integer = 6.
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− |
Match List-I with List-II: List-I