Electrochemistry Ques 2
2. The ionic conductance of $Ba^{2+}$ and $Cl^{-}$are respectively 127 and $76 ohm^{-1} cm^{2}$ at infinite dilution. The equivalent conductance (in ohm ${ }^{-1} cm^{2}$ ) of $BaCl_2$ at infinite dilution will be :
[2000]
(a) 139.5
(b) 203
(c) 279
(d) 101.5
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Answer:
Correct Answer: 2.(b)
Solution:
(b) The ionic conductance or equivalent conductance are given as:
$\lambda _{B a^{2+}}^{\infty}=127$ ohm $^{-1} cm^{2}$ equivalent ${ }^{-1}$
$\lambda _{Cl^{-}}^{\infty}=76$ ohm $^{-1} cm^{2}$ equivalent ${ }^{-1}$
The equivalent conductance of $BaCl_2$ at infinite dilution will be given by:
$ \begin{aligned} & \wedge_BaCl_2^{\infty}=\lambda _{Ba^{2}}^{\infty}+\lambda _{Cl^{-}}^{\infty}=127+76 \\ & =203 ohm^{-1} cm^{2} \text{ equivalent }{ }^{-1} \end{aligned} $
BETA
