Select correct combination of d-block cation and colour of the complex formed when d-block cation reacts with K4[Fe(CN)6].

Engineering

Chemistry

Dichromate and Permanganate Ion Reactions

Distinction tests

Test of Cations and Anions

Question

Select correct combination of d-block cation and colour of the complex formed when d-block cation reacts with K₄[Fe(CN)₆].

Cu²⁺, Chocolate brown

Zn²⁺, white

Fe³⁺, white

Fe²⁺, Blue

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(A) K₄[Fe(CN)₆] + Zn²⁺ —→ Zn₂[Fe(CN)₆] (White)

(B) K₄[Fe(CN)₆] + Cu²⁺ —→ Cu₂[Fe(CN)₆] $↓$ (Chocolate brown ppt.)

(D) K₄[Fe(CN)₆] + Fe³⁺ —→ Fe₄[Fe(CN)₆]₃ $↓$ (Prussian blue ppt.)