Question 1

An electrochemical reaction is characterized using EIS. In the first experiment, the solution resistance is made negligible by the addition of supporting electrolyte. In the second experiment, the solution resistance is large, due to a lack of supporting electrolyte. All other conditions remain the same. The latter case will differ from the former

Accepted Answer

A)   only in ZRe,
B)   only in ZIm
C)   in both ZRe and ZIm
D)   will not be different. C

Question 2

The effect of instabilities on EIS data can be identified using ______ (one word)

Accepted Answer

KKT

Question 3

Polarization resistance can be obtained from

Accepted Answer

A)   Cyclic voltammetry
B)   EIS
C)   chrono amperometry
D)   Linear Polarization B,D

Question 4

In a given system, EIS was acquired at multiple perturbation amplitudes, and all of them yielded the same data. Therefore, higher harmonics are negligible.

Accepted Answer

A) True 
 B)False

Question 5

Empirical evidence suggests that direct integration of KKT relations will not flag EIS acquired under large-signal conditions, if

Accepted Answer

A)   current potential relationship is exponential
B)   current potential relationship is linear
C)   both of the above
D)   none of the above

Question 6

When EIS is acquired experimentally, it is desirable to acquire data for multiple cycles because

Accepted Answer

A)   system response would be steady periodic
B)   the signal to noise will be better
C)   both of the above
D)   none of the above

Question 7

Taylor series expansion of sin(x) at x=0, in terms of 'x' is given by

Accepted Answer

A)    x+x33+…x + \frac { x ^ { 3 } } { 3 } + \ldotsx+3x3​+… 
B)    x−x33!+…x - \frac { x ^ { 3 } } { 3 ! } + \ldotsx−3!x3​+… 
C)   x−x33+…x - \frac { x ^ { 3 } } { 3 } + \ldotsx−3x3​+… 
D)    x+x33!+…x + \frac { x ^ { 3 } } { 3 ! } + \ldotsx+3!x3​+…

Question 8

In linear polarization measurement, the slope of current to potential yields

Accepted Answer

A)   Rp
B)   Rsol
C)   Rp+Rsol
D)   Rp-Rsol.

Question 9

Total harmonic distortion is calculated using

Accepted Answer

A)   magnitude and phase at fundamental and higher harmonics
B)   magnitude of fundamental and higher harmonics
C)   magnitude and phase of higher harmonics only
D)   magnitude of higher harmonics only

Question 10

For a reaction with one or more intermediates, at a given perturbation amplitude, the amplitude of oscillation in fractional surface coverage

Accepted Answer

A)   decreases with frequency
B)   increases with frequency
C)   can increase or decrease with frequency
D)   is independent of frequency

Question 11

In case of reaction with adsorbed intermediates, when there is repulsion between the adsorbed species, it is best described by

Accepted Answer

A)   Langmuir isotherm
B)   Frumkin isotherm
C)   Temkin isotherm
D)   none of the above

Question 12

In NLEIS, frequency response function (FRF)

Accepted Answer

A)   increase with Eac0,
B)   decrease with Eac0
C)   can increase or decrease with Eac0
D)   are independent of Eac0

Question 13

The value of modified Bessel function of zeroth order, at x= 0 , i.e. I₀(0) is ______

Accepted Answer

The answer of The value of modified Bessel function of...

Question 14

If an electrochemical system is unstable, the effects manifest in impedance spectra mainly at

Accepted Answer

A)   low frequencies
B)   mid frequencies
C)   high frequencies
D)   all of the above

Question 15

For a given reaction, impedance under pseudo galvanostatic mode can be calculated using

Accepted Answer

A)   Taylor series expansion
B)   Fourier series expansion
C)   numerical method
D)   all of the above.

Question 16

Charge transfer resistance can be obtained from

Accepted Answer

A)   Cyclic voltammetry
B)   EIS
C)   chronoamperometry
D)   Linear Polarization

Question 17

Even if there is no reaction at a particular condition in a given system, second harmonics can arise if the double-layer is described by

Accepted Answer

A)   Helmholtz model
B)   Gouy-Chapman model
C)   Stern model
D)   none of the above

Question 18

Taylor series expansion of cos(x) at x=0, in terms of 'x' is given by

Accepted Answer

A)    1−x22!+x44!−…1 - \frac { x ^ { 2 } } { 2 ! } + \frac { x ^ { 4 } } { 4 ! } - \ldots1−2!x2​+4!x4​−… 
B)    1−x22+x44−…1 - \frac { x ^ { 2 } } { 2 } + \frac { x ^ { 4 } } { 4 } - \ldots1−2x2​+4x4​−… 
C)    1+x22!+x44!−…1 + \frac { x ^ { 2 } } { 2 ! } + \frac { x ^ { 4 } } { 4 ! } - \ldots1+2!x2​+4!x4​−… 
D)    1+x22+x44−…1 + \frac { x ^ { 2 } } { 2 } + \frac { x ^ { 4 } } { 4 } - \ldots1+2x2​+4x4​−…

Question 19

When EIS is acquired experimentally, it is desirable to apply sinusoidal perturbation and acquire data after some time because

Accepted Answer