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6-2.Equilibrium-II (Ionic Equilibrium) question bank (Chemistry)

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Q1.

The equivalent conductance of benzoic acid is $12.8 \ ohm^{-1} \ cm^{2} \ eq^{-1}$. If the equivalent conductance of benzoate ion and $H^{+}$ ion at infinite dilution is $42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ and $288.42 \ ohm^{-1} \ cm^{2} \ eq^{-1}$ respectively,then its degree of dissociation is ............. $\%$

(A)

$39$

(B)

$3.9$

(C)

$0.35$

(D)

$0.039$

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Q2.

The ionisation constant of a weak acid $(HA)$ in terms of molar conductivity at infinite dilution $(\Lambda _m^\infty)$ and molar conductivity at concentration $C$ $(\Lambda _m)$ is given by:

(A)

$K_a = \frac{C\Lambda _m^\infty}{(\Lambda _m - \Lambda _m^\infty)}$

(B)

$K_a = \frac{C\Lambda _m^2}{\Lambda _m^\infty (\Lambda _m^\infty - \Lambda _m)}$

(C)

$K_a = \frac{C(\Lambda _m^\infty)^2}{\Lambda _m^\infty (\Lambda _m - \Lambda _m^\infty)}$

(D)

None of these

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