In which of the following pair of solutions will the values of van’t Hoff factor be same?
(Assuming same dissociation)

Number of particles dissociated are same.

As both are strong electrolytes, α=1 for them
K₄[Fe(CN)₆]→ 4K⁺ + [Fe(CN)₆]₄⁻
n = 5
FeSO₄(NH₄)₂SO₄.6H₂O→ Fe²⁺ + 2NH⁺₄ + 2SO²⁻₄
n = 5
As α=1 for both electrolytes and also n = 5 then van 't Hoff factor is the same for them.