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


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

E) A) and B)
F) B) and C)

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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


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

E) All of the above
F) None of the above

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

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KKT

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


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

E) A) and D)
F) B) and C)

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

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


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

E) None of the above
F) All of the above

Correct Answer

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


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

E) B) and D)
F) All of the above

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Polarization resistance can be obtained from


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

E) All of the above
F) A) and D)

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B,D

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


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

E) B) and D)
F) None of the above

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


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

E) All of the above
F) B) and D)

Correct Answer

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In case of reaction with adsorbed intermediates, when some sites are energetically favorable compared to other sites, it is best described by


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

E) B) and C)
F) A) and B)

Correct Answer

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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


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

E) None of the above
F) A) and D)

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C

In NLEIS, frequency response function (FRF)


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

E) A) and D)
F) C) and D)

Correct Answer

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Charge transfer resistance can be obtained from


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

E) A) and B)
F) B) and C)

Correct Answer

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


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

E) A) and B)
F) None of the above

Correct Answer

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

A) True
B) False

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Total harmonic distortion is calculated using


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

E) None of the above
F) A) and B)

Correct Answer

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


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

E) C) and D)
F) A) and B)

Correct Answer

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


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

E) B) and C)
F) A) and B)

Correct Answer

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


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

E) A) and B)
F) A) and C)

Correct Answer

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