Class 12 Chemistry Chapter 3 Electrochemistry Objective Type Questions and Answers | Class 12 Chemistry Chapter 3 Electrochemistry Quiz

1 Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm-1 w ill be

A 124 Ω-1 cm² mol-1

B 204 Ω-1 cm² mol-1

C 101 Ω-1 cm² mol-1

D 300 Ω-1 cm² mol-1

Answer:101 Ω-1 cm² mol-1

2 Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on

A the nature and structure of the metal

B the number of valence electrons per atom

C change in temperature

D all of these

View Answer

Answer:all of these

3 The specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm^-1 cm^-1 and the resistance of the cell containing this solution at 20°C is 55 ohm. The cell constant is

A 3.324 cm^-1

B 1.166 cm^-1

C 2.372 cm^-1

D 3.682 cm^-1

View Answer

Answer: 1.166 cm^-1

4 Faraday’s law of electrolysis is related to

A Atomic number of cation

B Speed of cation

C Speed of anion

D Equivalent weight of electrolyte

View Answer

Answer:Equivalent weight of electrolyte

5 The molar conductivity is maximum for the solution of concentration

A 0.004 M

B 0.002 M

C 0.005 M

D 0.001 M

View Answer

Answer: 0.001 M

6 Units of the properties measured are given below. Which of the properties has been not matched correctly?

A Molar conductance = Sm² mol^-1

B Cell constant = m^-1

C Specific conductance of = S m²

D Equivalence conductance = S m² (g eq)^-1

View Answer

Answer:Specific conductance of = S m²

7 How long would it take to deposit 50 g of Al from an electrolytic cell containing Al₂O₃ using a current of 105 ampere?

A 1.54 h

B 1.42 h

C 1.32 h

D 2.15 h

View Answer

Answer:1.42 h

8 How much electricity in in terms of Faraday is required to produce 100 g of Ca from molten CaCl2?

A 1F

B 2F

C 3F

D 5F

View Answer

Answer:5F

9 How much time is required to deposit 1 × 10-3 cm thick layer of silver (density of 1.05 g cm-3) on a surface of area 100 cm² by passing a current of 5 A through AgNO3 solution?

A 125 s

B 115 s

C 18.7 s

D 27.25 s

View Answer

Answer: 18.7 s

10 The aqueous solution of which of the following compounds is the best conductor of electric current?

A Acetic acid

B Hydrochloric acid

C Ammonia

D Fructose

View Answer

Answer: Hydrochloric acid

11 An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to

A increased ionic mobility of ions

B 100 percent electrolyte ionisation with natural dilution

C increase in both ion numbers and ionic mobility

D a rise in ion counts

View Answer

Answer: increased ionic mobility of ions

12 The ionic conductance of Ba2+ and Cl– are respectively 127 and 76 ohm-1 at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be

A 139.5

B 203

C 279

D 101.5

View Answer

Answer: 139.5

13 When heating one end of a metal plate, the other end gets hot because of

A the resistance of the metal

B mobility of atoms in the metal

C energised electrons moving to the other end

D minor perturbation in the energy of atoms

View Answer

Answer: energised electrons moving to the other end

14 The weight of silver displaced by a quantity of electricity which displaces 5600ml of O₂ at STP will be

A 5.4g

B 10.8g

C 54.9g

D 108.0g

View Answer

Answer:108.0g

15 Once a current of 1.0 ampere was passed through one litre of CuCl₂ solution for 16 min and 5 sec, all of the solution’s copper was deposited at the cathode. The power of solution CuCl₂ was (Molar mass of Cu = 63.5; Faraday constant = 96,500 C/mol)

A 0.01N

B 0.01M

C 0.02M

D 0.2N

View Answer