Conductance of Electrolytic Solutions

Q. A, B and C are three electrolytic cells, connected in different circuits. Cell ‘A’ contains NaCl solution, and the bulb in the circuit glows brightly when the circuit is completed. Cell ‘B’ contains acetic acid in which the bulb glows dimly. Cell ‘C’ contains sugar solution inwhich the bulb does not glow. Give a reason for each observation.​ [3 Marks]

Q.

The equivalent conductivity of a solution containing 2.54g of $CuS{O}_4$ per litre is 91.0 W^-1 cm² eq^-1. Its conductivity would be

1. 1.45 x 10^-3W^-1cm^-1

2. 2.17 x 10^-3W^-1cm^-1

3. 2.90 x 10^-3W^-1cm^-1

4. 2.9 x 10^-3W^-1cm^-1

Q.

Consider the statements about electric conductivity.

i)Copper metal:Flow of electric current happens by the electron flow.

ii)Copper sulphate solution:Flow of electric current happens by the electrons, molecules and ions.

1. Only i) is correct
2. Only ii) is correct
3. Both i) and ii) are correct
4. Both i) and ii) are incorrect

Q.

The conductance in electrolytic solutions is due to flow of ions which are produced by the decomposition of matter.

1. True
2. False

Q.

During electrolysis of an electrolyte, the number of ions produced is independent of the _______ .

1. Nature of solvent
2. Nature of the electrolyte
3. Temperature
4. All of the above

Q. The resistance and conductivity of 0.02 M KCl solution are 82.4 ohm and $0.002768Sc{m}^{-1}$, respectively. When filled with $0.005N{K}_{2}S{O}_4$, the solution had a resistance of 324 ohm. Calculate conductivity of $K_{2}S{O}_4$ solution (conductance and cell constant calculated in previous problems are $3.086\times {10}^{(-3)}S$ and ​$0.228c{m}^{-1})$

1. $5.04\times {10}^{-4}Sc{m}^{-1}$
2. $9.04\times {10}^{-4}Sc{m}^{-1}$
3. $3.04\times {10}^{-4}Sc{m}^{-1}$
4. $7.04\times {10}^{-4}Sc{m}^{-1}$

Q.

Which of the following is true?

1. Distilled water conducts electricity

2. Salt solution does not conduct electricity

3. Dilute hydrochloric acid does not conduct electricity

4. Dilute hydrochloric acid conducts electricity

Q. Which of the following plot correctly represents the variation of concentration of a surfactant (e.g. sodium doedecyl sulphate) versus molar conductivity with regard to behavior at CMC?

1. a
2. b
3. c
4. d

Q. Which of the following is correct order of increasing conductance?

1. ${\wedge }_{m}HCl$> ${\wedge }_{m}KCl$ > ${\wedge }_{m}NaCl$ >${\wedge }_{m}LiCl$
2. ${\wedge }_{m}LiCl>{\wedge }_{m}HCl>{\wedge }_{m}NaCl>{\wedge }_{m}KCl$
3. ${\wedge }_{m}LiCl$> ${\wedge }_{m}NaCl$ > ${\wedge }_{m}KCl$ >${\wedge }_{m}HCl$
4. ${\wedge }_{m}LiCl$> ${\wedge }_{m}NaCl$ > ${\wedge }_{m}HCl$ >${\wedge }_{m}KCl$

Q.

It has been observed that gaseous hydrogen chloride is a very poor conductor of electricity but a solution of hydrogen chloride gas in water is a good conductor of electricity. This is due to the fact that

1. Hydrogen chloride gas in water solution ionizes
2. A gas is non-conductor but a liquid conducts electricity
3. Gas does not obey Ohm's law whereas solution does
4. Water is good conductor of electricity