Conductance and Conductivity

Q. The correct order of equivalent conductance at infinite dilution for $LiCl$, $NaCl$, and $KCl$ would be:

1. $KCl>NaCl>LiCl$
2. $LiCl>NaCl>KCl$
3. $LiCl>KCl>NaCl$
4. $LiCl\cong NaCl>KCl$

Q. The resistance of a $0.5M$ solution of an electrolyte in a cell was found to be $50\Omega$. If the electrodes in the cell are $2.2cm$ apart and have an area of $4.4c{m}^2$ then the molar conductivity (in $S{m}^{2}mo{l}^{-1}$) of the solution is:

1. 0.2
2. 0.02
3. 0.002
4. None of these

Q. The resistance of a $0.2\text{M}$ solution of an electrolyte is $50\Omega$. The specific conductance of the solution is $1.4{\text{S m}}^{-1}$ .
The resistance of a $0.5\text{M}$ solution of the same electrolyte occupying the same volume is $280\Omega$. The molar conductivity of the above mentioned $0.5\text{M}$ solution of the electrolyte in ${\text{S m}}^2{\text{mol}}^{-1}$ is:

1. $5\times {10}^3$
2. $5\times {10}^2$
3. $5\times {10}^{-3}$
4. $5\times {10}^{-4}$

Q. The standard units of conductivity or specific conductance [k] is
Where S = Siemens
cm = centimeter

1. $S^{-1}c{m}^{-1}$
2. $Scm$
3. $S^{-1}cm$
4. $Sc{m}^{-1}$

Q. The molar conductance of $N{H}_{4}OH$ at 0.01M concentration is 11.3 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$. The degree of dissociation
of $N{H}_{4}OH$ is
(molar conductance at infinite dilution is 271.1)

1. $4.2\%$
2. $1.3\%$
3. $12.6\%$
4. $41\%$

Q. Which of the following statement(s) is(are) true?
A. The conductance of an electrolyte is dependent on the nature of the electrolyte.
B. Conductance of a solution equals the inverse of resistivity of the solution.
C. In an electrolytic cell the flow of electrons is from cathode to anode.

1. A, B
2. A, C
3. Only A
4. Only C

Q. The resistance of a $0.2\text{M}$ solution of an electrolyte is $50\Omega$. The specific conductance of the solution is $1.4{\text{S m}}^{-1}$ .
The resistance of a $0.5\text{M}$ solution of the same electrolyte occupying the same volume is $280\Omega$. The molar conductivity of the above mentioned $0.5\text{M}$ solution of the electrolyte in ${\text{S m}}^2{\text{mol}}^{-1}$ is:

1. $5\times {10}^3$
2. $5\times {10}^2$
3. $5\times {10}^{-3}$
4. $5\times {10}^{-4}$

Q.

Which of the following shows electrical conduction

[CBSE PMT 1999; AIIMS 1999]

1. Potassium

2. Graphite

3. Diamond

4. Sodium

Q. The standard units of conductivity or specific conductance [k] is
Where S = Siemens
cm = centimeter

1. $S^{-1}c{m}^{-1}$
2. $Sc{m}^{-1}$
3. $Scm$
4. $S^{-1}cm$

Q. The correct order of equivalent conductance at infinite dilution for $LiCl$, $NaCl$, and $KCl$ would be:

1. $KCl>NaCl>LiCl$
2. $LiCl>NaCl>KCl$
3. $LiCl>KCl>NaCl$
4. $LiCl\cong NaCl>KCl$

Q. When a solution of specific conductance $1.342{\text{Sm}}^{-1}$ was placed in a conductivity cell with parallel electrodes, the resistance was found to be $170.5\text{ohm}$. The area of the electrodes is $1.86\times {10}^{-4}{\text{m}}^2$ . Calculate the distance between the electrodes.

1. $0.0452\text{m}$
2. $0.425\text{m}$
3. $4.25\text{m}$
4. $42.5\text{m}$