Conductance of Electrolytic Solutions

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.

The unit of electrochemical equivalent is

1. Gram

2. Gram/ampere

3. Gram/coulomb

4. Coulomb/gram

Q.

Which of the following is/are the property of an electrolyte?

1. It conducts electric current.

2. Ionizes when it is dissolved in a solvent.

3. It can generate ions in molten state.

4. It can be solid too.

Q.

Electrolytes are the substances which conduct electricity only in aqueous solution.

1. True

2. False

Q.

A substance that is added to the charge in a furnace to remove gangue particles is termed as __.

Q. In electrolysis of water :
(a) Name the gas collected at cathode and anode.
(b) Why is volume of one gas collected at one electrode is double of
another ?
(c) Why are few drops of dil. H2
SO4
added to water ?

Q.

Give a reason for the following observation

An aqueous solution of common salt conducts electricity whereas, that of sugar does not.

Q.

Give a reason for the following

An aqueous solution of Sodium chloride conducts electricity

Q. Three different electrolytic cells A, B and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugar solution and the bulb does not glow. Give a reason for each of these observations.

Q. In the electrolysis of water
1. Name the gas collected at anode and cathode.
2. why is the volume of gas collected at one electrode double than the other?
3. what will happen if dil H2SO4 is not added to water

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. During the electrolysis of an electrolyte, the number of ions produced is dependent on ___.

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

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

Q. The conductance in an electrolytic solution is due to the flow of ions which are produced by the process of decomposition.

1. False
2. True

Q. Choose the correct pair from the options given below.

1. Electronic conductor - Iron
   Electrolytic conductor - Graphite
2. Electronic conductor - Graphite
   Electrolytic conductor - Sulphuric acid
3. Electronic conductor - Sulphuric acid
   Electrolytic conductor - Copper
4. Electronic conductor - Sodium hydroxide
   Electrolytic conductor - Nitric acid

Q.

Select the correct statements regarding metallic conduction.

1. Happens by the movement of electrons

2. Happens by the movement of ions

3. Involves the transfer of matter.

4. Does not involve any transfer of matter.

Q.

Which ion will be migrating towards anode during electrolysis of concentrated NaCl solution?

OR

What will be the reaction taking place at anode during the electrolysis of concentrated NaCl solution?_{^{​​​​​​}}

Q.

The equivalent conductivity of a solution containing 2.54g of CuSO₄ per litre is 91.0 W^-1 cm² eq^-1. Its conductivity is:

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.

How was the electrical nature of matter indi­cated?

Q.

Assertion : Salts like $KCl,KN{O}_3$ i.e., inert electrolytes are used in salt bridge.

Reason : An inert electrolyte can easily be filled in the U-tube.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.

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

Q.

Write the products produced when an aqueous solution of NaCl is electrolysed.

Q. The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is $5.55\times {10}^3$ ohm. Calculate its resistivity, conductivity, and molar conductivity.

1. $87.135\times {10}^{-2}ohmm,1.148S{m}^{-1},229.6\times {10}^{-4}S{m}^{2}mo{l}^{-1}$
2. $67.135\times {10}^{-2}ohmm,1.489S{m}^{-1},229.6\times {10}^{-4}S{m}^{2}mo{l}^{-1}$
3. $87.135\times {10}^{-2}ohmm,1.296S{m}^{-1},229.6\times {10}^{-4}S{m}^{2}mo{l}^{-1}$
4. $77.135\times {10}^{-2}ohmm,1.148S{m}^{-1},229.6\times {10}^{-4}S{m}^{2}mo{l}^{-1}$

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. There are four solutions of NaCl of the given concentrations :
(i) 1.0M(ii) 0.1M(iii) 0.01M(iv) 0.5M

Which of the following options represent their correct order of equivalent conductance?

1. i> ii > iv > iv

2. i> iv > ii > iii

3. ii > iii > iv >i

4. iii > ii > iv >i

Q. We have known that we should not touch the switch of any electric appliance with watery hands. But in an experiment we put hydrochloric acid to water for it to conduct electricity .Does not water conduct electricity, why is there a need of hydrochloric acid or any other ways to put in it?

Q. ntIn the electrolysis of an aqueos solution of sodium sulphate 2.4 litre of oxygen at STP was liberated at anode . The volume of hydrogen at STP liberated at cathode would be ?n

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.

What is an electrolyte

Q.

1. Cu, though a good conductor of electricity is a non electrolyte. Why?

2. Solid sodium chloride does not allow electricity to pass through. Why?