Which of the following has highest molar conductivity

Options

A. Diamminedichloroplatinum (II)
B. Tetraamminedichlorocobalt (III)chloride
C. Potassiumhexacyanoferrate (II)
D. Hexaaquochromiun (III)bromide

Answer

C

Explanation

As the number of ions if complex compounds when dissolved in water increases, molar conductivity also increases.
1 Mole of `[Pt(NH_(3))_(2)Cl_(2)]` gives one mole of ions
1 Mole of `[Co(NH_(3))_(4)Cl_(2)]Cl` gives two mole of ions
1 Mole of `K_(4)[Fe(CN)_(6)]` gives five moles of ions
1 Mole of `[Fe(CO)_(5)]` gives zero moles of ions (because it is a neutral molecule)
Hence `K_(4)[Fe(CN)_(6)]` has the highest molar conductivity.