Electrochemistry Test

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Electrochemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Electrochemistry deals with the production of electricity from

A
nuclear energy and the use of electrical energy to bring about non-spontaneous chemical transformations

B
energy released during spontaneous chemical reactions and the use of heat energy to bring about non-spontaneous chemical transformations

C
energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations

D
nuclear energy and the use of heat energy to bring about non-spontaneous chemical transformations

Solution

Electrochemistry is branch of chemistry that deals with production of electricity from a redox chemical reaction or carrying out a non spontaneous reaction using electrical energy.
Question 2
1 / -0

Galvanic or a voltaic cell converts the chemical energy liberated during a redox reaction to

A
electrical energy

B
thermal energy

C
acoustic energy

D
electromagnetic energy

Solution

Galvanic cells convert chemical energy to electrical energy.
Question 3
1 / -0

Electrolytic cell uses electrical energy to bring about

A
non-spontaneous chemical reactions

B
spontaneous chemical reactions

C
spontaneous nuclear reactions

D
non-spontaneous nuclear reactions

Solution

Electrolytic cell drives a non- spontaneous redox chemical reaction by application of electrical energy.
Question 4
1 / -0

Fundamental difference between an electrolytic cell and the galvanic cell is that in electrolytic cell

A
the free energy is supplied in the form of mechanical work done on the system by the outside world

B
the free energy decreases as work is done by the system on the outside world

C
in electrolytic cell the free enenrgy is supplied in the form of mechanical work done by the system on the outside world

D
the free energy is supplied in the form of electrical work done on the system by the outside world

Solution

In electrolytic cell electrical energy is converted into chemical energy. Here the electrical energy is used to drive redox reactions which have positive free energy and are non spontaneous.
Question 5
1 / -0

Standard electrode potential is measured taking the concentrations of all the species involved in a half-cell is

A
1 M

B
4 M

C
2M

D
3M

Solution

Under standard condition that is at 298K, the molar concentration of every species taken in each half cell is 1 M and if gases are involved the partial pressure of the gas is taken as 1 atm.
Question 6
1 / -0

Standard hydrogen electrode operated under standard conditions of 1 atm H₂pressure, 298K, and pH = 0 has a cell potential of

A
1.0 V

B
0.33 V

C
0.5 V

D
0V

Solution

Standard electrode potential of hydrogen electrode under standard conditions is taken as 0V by convention.
Question 7
1 / -0

Molar conductivity denoted by the symbol ΛmΛm is related to the conductivity of the solution by the equation (κ is the conductivity and c the concentration)

A
Λm = c/k

B
Λm = k/c

C
Λm = kc

D
Λm = 2k/c

Solution

Molar conductivity is conducting power of all the ions produced by dissolving 1 mole of electrolyte in solution.

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Re-Attempt Weekly Quiz Competition

Electrochemistry Test - 4

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Electrochemistry Test - 4

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Question 1

nuclear energy and the use of electrical energy to bring about non-spontaneous chemical transformations

energy released during spontaneous chemical reactions and the use of heat energy to bring about non-spontaneous chemical transformations

energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations

nuclear energy and the use of heat energy to bring about non-spontaneous chemical transformations

Solution

Question 2

electrical energy

thermal energy

acoustic energy

electromagnetic energy

Solution

Question 3

non-spontaneous chemical reactions

spontaneous chemical reactions

spontaneous nuclear reactions

non-spontaneous nuclear reactions

Solution

Question 4

the free energy is supplied in the form of mechanical work done on the system by the outside world

the free energy decreases as work is done by the system on the outside world

in electrolytic cell the free enenrgy is supplied in the form of mechanical work done by the system on the outside world

the free energy is supplied in the form of electrical work done on the system by the outside world

Solution

Question 5

1 M

4 M

2M

3M

Solution

Question 6

1.0 V

0.33 V

0.5 V

0V

Solution

Question 7

Λm = c/k

Λm = k/c

Λm = kc

Λm = 2k/c

Solution

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