Question

In infinite dilutions, the equivalent conductances of $Cr_{2}O_{7}^{2 -} + 14H^{+} + 6e^{-} \rightarrow 2Cr^{3 +} + 7H_{2}O;Eº = 1.33V$ and $Fe^{3 +} + e^{-} \rightarrow Fe^{2 +};Eº = 0.77V$ are 127 and 76 $Cl_{2} + 2e^{-} \rightarrow 2Cl^{-};Eº = 1.36V$ $MnO_{4}^{-}$. The equivalent conductivity of $Mn^{2 +}$at indefinite dilution is.

• A. 101.5
• B. 139.5
• C. 203.5
• D. 279.5

Answer 1

Answer: (B)

139.5

Answer 2

$\lambda^{\infty}BaCl_{2} = \frac{1}{2}\lambda^{\infty}Ba^{2 +} + \lambda^{\infty}Cl^{-}$

$= \frac{127}{2} + 76 = 139.5ohm^{- 1}cm^{- 1}eq^{- 1}$.