Find number of basic radicals among the following cations, which can form soluble complex on adding excess of NH3 solution : Cd2+(aq.), Pb2+(aq.), Ni2+(aq.), Mn2+(aq.), Zn2+(aq.), Ag+(aq.), Hg2+(aq.),

Question

Find number of basic radicals among the following cations, which can form soluble complex on adding excess of NH3 solution : Cd2+(aq.), Pb2+(aq.), Ni2+(aq.), Mn2+(aq.), Zn2+(aq.), Ag+(aq.), Hg2+(aq.), Fe3+(aq.), Mg2+(aq.)

Prashant Kotian · Accepted Answer

Correct answer: **4** / SOLUBLE IN EXCESS NH3 SOLUTION: CD2+(AQ.), NI2+(AQ.), ZN2+(AQ.), AG+(AQ.). Step 1: Identify the reactants. Ferric cyanide, Fe(CN)3↓, is an insoluble precipitate. Step 2: Analyze the complexation. The addition of potassium cyanide (KCN) provides excess cyanide ligands that coordinate with iron(III) to form the highly stable, soluble coordination complex potassium ferricyanide (K3[Fe(CN)6]). Step 3: Since the solid ferric cyanide precipitate dissolves to yield a clear soluble complex solution, this is a precipitate dissolution reaction (type B). Thus, the correct option is (b).

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