Select the correct statements :

Question

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Statement A is correct because potassium ferrocyanide is diamagnetic ( $μ = 0$ ), while potassium ferricyanide is paramagnetic ( $μ = 1.73 BM$ due to one unpaired electron).

Statement B is correct because only $[C o (N H_{3})_{5} B r] S O_{4}$ releases free SO₄²⁻ ions to form a white BaSO₄ precipitate with aqueous BaCl₂.

Statement C is correct because the two isomers release different counter-ions (Br⁻ and Cl⁻), forming distinctly colored precipitates (AgBr is pale yellow, AgCl is white) with AgNO₃.

Statement D is correct because $[C o (N H_{3})_{6}] C l_{3}$ dissociates into $4$ ions ( $1 : 3$ electrolyte), whereas $[C o (N H_{3})_{5} Cl] C l_{2}$ dissociates into $3$ ions ( $1 : 2$ electrolyte), yielding different molar conductivities.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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