MCQ
The equivalent conductance of NaCl at concentration C and at infinite dilution are $\lambda_{ c }$ and $\lambda_{\infty}$ relationship. The correct relationship between $\lambda_{ c }$ and $\lambda_{\infty}$ is given as (where, the constant B is positive)
  • A
    $\lambda_{ c }=\lambda_{\infty}+( B ) C$
  • B
    $\lambda_{ c }=\lambda_{\infty}+( B ) \sqrt{C}$
  • C
    $\lambda_{ c }=\lambda_{\infty}-( B ) \sqrt{C}$
  • D
    $\lambda_{ c }=\lambda_{\infty}-( B ) C$

Answer

C. $\lambda_{ c }=\lambda_{\infty}-( B ) \sqrt{C}$
Explanation:
According to Debye Huckel Onsager equation,
$
\lambda_{c}=\lambda_{\infty}-(B) \sqrt{C}
$
where, $\lambda_{ c }=$ limiting equivalent conductivity at concentration C
$\lambda_{\infty}=$ limiting equivalent conductivity at infinite dilution
$C =$ concentration

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