An increase in molar conductance of a strong electrolyte with dilution is mainly due to

  • A
    Increase in number of ions
  • B
    Increase in ionic mobility of ions
  • C
    $100\%$ ionisation of electrolyte at normal dilution
  • D
    Increase in both i.e. number of ions and ionic mobility of ions.

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The molar conductivity for electrolytes $A$ and $B$ are plotted against $C^{1/2}$ as shown below. Electrolytes $A$ and $B$ respectively are:

The dissociation constant of acetic acid is $1.75 \times 10^{-5}$ and $\Lambda _{CH_3COOH}^o = 370.6 \times 10^{-4} \, S \, m^2 \, mol^{-1}$. The specific conductance of $0.01 \, M$ acetic acid solution will be:

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The ionisation constant of a weak acid $(HA)$ in terms of $\Lambda _m^\infty$ and $\Lambda _m$ is:

Calculate $\Lambda _m^o$ for $CaCl_2$ and $MgSO_4$ from the data given in the table below:
Ion and $\lambda ^o / (S \ cm^2 \ mol^{-1})$ Ion and $\lambda ^o / (S \ cm^2 \ mol^{-1})$
$H^{+} : 349.6$ $OH^{-} : 199.1$
$Na^{+} : 50.1$ $Cl^{-} : 76.3$
$K^{+} : 73.5$ $Br^{-} : 78.1$
$Ca^{2+} : 119.0$ $CH_3COO^{-} : 40.9$
$Mg^{2+} : 106.0$ $SO_4^{2-} : 160.0$

The specific conductance $(k)$ of $0.02 \ M$ aqueous acetic acid solution at $298 \ K$ is $1.65 \times 10^{-4} \ S \ cm^{-1}$. The degree of dissociation $(\alpha)$ of acetic acid is: [Given: $\lambda_{H^{+}}^{\infty} = 349.1 \ S \ cm^2 \ mol^{-1}$ and $\lambda_{CH_3COO^{-}}^{\infty} = 40.9 \ S \ cm^2 \ mol^{-1}$]

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