Chapter 8

The resistance of \(0.1 \mathrm{~N}\) solution of formic acid is \(200 \mathrm{ohm}\) and cell constant is \(2.0 \mathrm{~cm}^{-1}\). The equivalent conductivity (in \(\mathrm{Scm}^{2} \mathrm{eq}^{-1}\) ) of \(0.1 \mathrm{~N}\) formic acid is : (a) 100 (b) 10 (c) 1 (d) none of these

A conductance cell was filled with a \(0.02 \mathrm{M} \mathrm{KCl}\) solution which has a specific conductance of \(2.768 \times 10^{-3} \mathrm{ohm}^{-1} \mathrm{~cm}^{-1}\). If its resistance is \(82.4 \mathrm{ohm}\) at \(25^{\circ} \mathrm{C}\), the cell constant is : (a) \(0.2182 \mathrm{~cm}^{-1}\) (b) \(0.2281 \mathrm{~cm}^{-1}\) (c) \(0.2821 \mathrm{~cm}^{-1}\) (d) \(0.2381 \mathrm{~cm}^{-1}\)

The ionic conductivity of \(\mathrm{Ba}^{2+}\) and \(\mathrm{Cl}^{-}\) at infinite dilution are 127 and \(76 \mathrm{ohm}^{-1} \mathrm{~cm}^{2} \mathrm{eq}^{-1}\) respectively. The equivalent conductivity of \(\mathrm{BaCl}_{2}\) at infinity dilution (in \(\mathrm{ohm}^{-1} \mathrm{~cm}^{2} \mathrm{eq}^{-1}\) ) would be : (a) 203 (b) 279 (c) \(101.5\) (d) \(139.5\)

Unit of ionic mobility is: (a) \(\mathrm{m} \mathrm{V}^{-1} \mathrm{~s}^{-1}\) (b) \(\mathrm{m}^{2} \mathrm{~V}^{-2} \mathrm{~s}^{-1}\) (c) \(\mathrm{m}^{2} \mathrm{~V}^{-1} \mathrm{~s}^{-1}\) (d) \(\mathrm{m}^{-2} \mathrm{~V} \mathrm{~s}^{-1}\)

\(\Lambda_{\mathrm{AgCl}}^{\infty}\) can be obtained : (a) by extraplotation of the graph \(\Lambda\) and \(\sqrt{C}\) to zero concentration (b) by known values of \(\Lambda^{\infty}\) of \(\mathrm{AgNO}_{3}, \mathrm{HCl}\) and \(\mathrm{HNO}_{3}\) (c) both (a) and (b) (d) None of these

The conductance of a salt solution \((A B)\) measured by two parallel electrodes of area \(100 \mathrm{~cm}^{2}\) separated by \(10 \mathrm{~cm}\) was found to be \(0.0001 \Omega^{-1}\). If volume enclosed between two electrode contain \(0.1\) mole of salt, what is the molar conductivity \(\left(\mathrm{Scm}^{2} \mathrm{~mol}^{-1}\right)\) of salt at same concentration : (a) 10 (b) \(0.1\) (c) 1 (d) none of these

The conductivity of a strong electrolyte : (a) Increases on dilution (b) Decreases on dilution (c) Does not change with dilution (d) Depends upon density of electrolytes

The increase in equivalent conductance of a weak electrolyte with dilution is due to : (a) Increase in degree of dissociation and decrease in ionic mobility (b) Decrease in degree of dissociation and decrease in ionic mobility (c) Increase in degree of dissociation and increase in ionic mobility (d) Decrease in degree of di?sociation and increase in ionic mobility

The electric conduction of a salt solution in water depends on the : (a) Size of its molecules (b) Shape of its molecules (c) Size of solvent molecules (d) Extent of its ionization

Which of the following is arranged in increasing order of ionic mobility? (a) \(\mathrm{I}^{-}<\mathrm{Br}^{-}<\mathrm{Cl}^{-}<\mathrm{F}^{-}\) (b) \(\mathrm{F}^{-}<\mathrm{Cl}^{-}<\mathrm{Br}^{-}<\mathrm{I}^{-}\) (c) \(\mathrm{F}^{-}<\mathrm{I}^{-}<\mathrm{Cl}^{-}<\mathrm{Br}^{-}\) (d) \(\mathrm{F}^{-}\left\langle\mathrm{Cl}^{-}<\mathrm{I}^{-}<\mathrm{Br}^{-}\right.\)