(A) (a) The conductivity of 0.1 mol L^-1 solution of NaC l is 1.06 × 10^-2 S cm^-1. Calculate its molar conductivity and degree of dissociation. 3 +…

The conductivity of $\displaystyle 0.1 \mathrm{~mol} \mathrm{~L}^{-1}$ solution of $\displaystyle \mathrm{NaC} l$ is $\displaystyle 1.06 \times 10^{-2} \mathrm{~S} \mathrm{~cm}^{-1}$. Calculate its molar conductivity and degree of dissociation. $\displaystyle 3$ + $\displaystyle 2$ \[\begin{aligned} & \lambda^{\circ} \mathrm{Na}^{+}=50.1 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \\ & \lambda^{\circ}{ }_{\mathrm{Cl}}^{-}=76.5 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \end{aligned} \]

Following cell reaction occurs in a galvanic cell : \[2 \mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{Zn}_{(\mathrm{s})} \longrightarrow 2 \mathrm{Ag}_{(\mathrm{s})}+\mathrm{Zn}_{(\mathrm{aq})}^{2+} \mathrm{E}_{(\mathrm{cell})}^{\circ}=+1.56 \mathrm{~V} \] Predict the direction of flow of current.

Differentiate between a primary battery and a secondary battery.

Resistance of a conductivity cell filled with $\displaystyle 0.1$ M KCl solution is $\displaystyle 100 \Omega$. If the resistance of the same cell when filled with $\displaystyle 0.01$ $\displaystyle \mathrm{mol} \mathrm{L}^{-1} \mathrm{KC} l$ solution is $\displaystyle 300 \Omega$, calculate the conductivity and molar conductivity of $\displaystyle 0.01 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{KCl}$ solution. The conductivity of $\displaystyle 0.1 \mathrm{M} \mathrm{KC} l$ solution is $\displaystyle 1.29 \times 10^{-2} \mathrm{~S} \mathrm{~cm}^{-1}$. $\displaystyle 3$ + $\displaystyle 2$

Write any two advantages of $\displaystyle \mathrm{H}_{2}-\mathrm{O}_{2}$ fuel cell.

Why does the cell potential of mercury cell remain constant throughout the life ?