Electrochemistry Test

Electrochemistry

This is electrochemistry Test-01 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Electrochemistry is the study of production of electricity from
  • A
    energy released during spontaneous chemical reactions and the use of heat energy to bring about non-spontaneous chemical transformations
  • B
    energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations
    Correct
  • C
    nuclear energy and the use of heat energy to bring about non-spontaneous chemical transformations
  • D
    nuclear energy and the use of electrical energy to bring about non-spontaneous chemical transformations
2
Galvanic or a voltaic cell converts the chemical energy liberated during a redox reaction to
  • A
    electromagnetic energy
  • B
    electrical energy
    Correct
  • C
    acoustic energy
  • D
    thermal energy
3
Electrolytic cell is a device for using electrical energy to carry
  • A
    spontaneous chemical reactions
  • B
    non-spontaneous chemical reactions
    Correct
  • C
    non-spontaneous chemical reactions
  • D
    non-spontaneous chemical reactions
4
Fundamental difference between an electrolytic cell and the galvanic cell is that in an electrolytic cell free energy
  • A
    is supplied in the form of electrical work done on the system by the outside world
    Correct
  • B
    is supplied in the form of mechanical work done by the system on the outside world
  • C
    is supplied in the form of mechanical work done on the system by the outside world
  • D
    decreasesas work is done by the system by the on outside world
5
Standard electrode potential are measured with the concentrations of all the species involved in a half-cell is
  • A
    4
  • B
    2
  • C
    3
  • D
    1
    Correct
6
standard hydrogen electrode operated under standard conditions of 1 atm H2 pressure, 25°C, and pH = 0 has a cell potential of
  • A
    0.33 V
  • B
    0.5 V
  • C
    0V
    Correct
  • D
    1.0 V
7
For a general electrochemical reaction of the type : Nernst equation can be written as:
Question 7 figure 1
  • A
    Option A
  • B
    Option B
  • C
    Option C
  • D
    Option D
    Correct
8
Relationship between equilibrium constant of the reaction and standard potential of the cell in which that reaction takes place is
  • A
    Option A
  • B
    Option B
  • C
    Option C
    Correct
  • D
    Option D
9
The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy and therefore, if the emf of the cell is E and nF is the amount of charge passed and ΔrG is the Gibbs energy of the reaction, then
  • A
    Option A
  • B
    Option B
    Correct
  • C
    Option C
  • D
    Option D
10
Molar conductivity denoted by the symbol Λm is related to the conductivity of the solution by the equation (κis the conductivity and c the concentration)
  • A
    Option A
    Correct
  • B
    Option B
  • C
    Option C
  • D
    Option D
11
Difference between ionic (electrolytic) and electronic conductivity is that electronic conductance takes place in metals by ________ conductance takes place in solutions by ions
  • A
    electron cloud and electrolytic
    Correct
  • B
    ions and electrolytic
  • C
    electron cloud and electrolytic
  • D
    electron cloud and electronic
12
When measuring conductivity with a conductivity cell, cell constant denoted by the symbol G* is given by (electrode area of cross section equal to ‘A’ and separated by distance ‘l’)
  • A
    Option A
  • B
    Option B
  • C
    Option C
    Correct
  • D
    Option D
13
Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes because of the fact that
  • A
    the number of collisions of ions per unit volume that carry the current in a solution increases on dilution
  • B
    mobility of ions that carry the current in a solution increases on dilution
  • C
    the number of ions per unit volume that carry the current in a solution decreases on dilution
    Correct
  • D
    the number of ions per unit volume that carry the current in a solution increases on dilution
14
Kohlrausch law of independent migration of ions states
  • A
    that limiting molar conductivity of an electrolyte can be represented as the difference of the individual contributions of the anion and cation of the electrolyte
  • B
    none of these
  • C
    that molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte
  • D
    that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte
    Correct
15
According to Faraday’s First Law of ElectrolysisThe amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the
  • A
    voltage of electricity passed through the electrolyte
  • B
    quantity of electricity passed through the electrolyte
    Correct
  • C
    quantity of electricity passed through the electrolyte
  • D
    current passed through the electrolyte