Redox Reactions And Electrochemistry Ques 79

Question: If equivalent conductance of $ 1M $ benzoic acid is $ 12.8oh{m^{-1}}cm^{2} $ and if the conductance of benzoate ion and $ {H^{+}} $ ion are 42 and $ 288.42,oh{m^{-1}}cm^{2} $ respectively. its degree of dissociation is [DPMT 2005]

Options:

A) 39%

B) 3.9%

C) 0.35%

D) 0.039%

Show Answer

Answer:

Correct Answer: B

Solution:

$ \Lambda _{m,(C_6H_5COOH)}^{o}=\Lambda _{,(C_6H_5CO{O^{-}})}^{o}+\Lambda _{({H^{+}})}^{o} $ $ =42+288.42=330.42 $ $ \alpha =\frac{\Lambda _m^{c}}{\Lambda _m^{o}}=\frac{12.8}{330.42}=3.9% $



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