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

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

Questions
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

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

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

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

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

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

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

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

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

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

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

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

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

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

Answer:0.01N
16 On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
A hydrogen
B oxygen
C hydrogen sulphide
D sulphur dioxide

Answer: oxygen
17 A device that converts the energy of combustion of fields like hydrogen and methane directly into electrical energy is known as
A Electrolytic cell
B Dynamo
C Ni-Cd cell
D Fuel cell

Answer:Fuel cell
18 Which reaction is not feasible?
A 2KO + Br2 2KBr + I2
B 2KBr + I2 2KI + Br2
C 2KBr + Cl2 2KCl + Br2
D 2H2O + 2F2 4HF + O2

Answer: 2KBr + I2 2KI + Br2
19 Without losing its concentration ZnCl2 solution cannot be kept in contact with
A Au
B Al
C Pb
D Ag

Answer: Al

Chapters

Assam Direct Recruitment Test Series

Teacher Eligibility Test

Assam Direct Recruitment Test Series