Which of the following is/are correct regarding concentration polarization?
a) Diffusion of ions in the bulk solution is the controlling factor
b) It usually operates at a high current density
c) It is a continuation of Activation polarization
d) It is a continuation of activation polarization, diffusion of ions in the bulk solution is the controlling factor and it usually operates at high current densities
Q.2.
What is depicted in the given figure?
a) Activation polarization
b) Concentration polarization
c) Resistance polarization
d) Activation and concentration polarization
Q.3.
What is the formula to determine limiting diffusion current density (iL) of concentration polarization?
a) iL=xnFCB/D
b) iL=DCB /nFx
c) iL=DnFCB/x
d) iL=x/DnFCB
Q.4.
Agitation will increase the limiting diffusion current density of concentration polarization.
a) True
b) False
Q.5.
Which of the following is/are correct regarding the given figure?
a) Velocity, temperature, and concentration are the factors that influence limiting current density
b) Limiting current density decreases with an increase in velocity, temperature, and concentration
c) Limiting current density increase with the increase in velocity, temperature, and concentration
d) Velocity, temperature, and concentration are the factors that influence limiting current density and it increases as it increases
Q.6.
Which of the following type(s) of polarization is depicted in the given figure?
a) Activation polarization
b) Concentration polarization
c) Activation and concentration polarization
d) Resistance polarization
Q.7.
Which of the following is/are correct regarding resistance polarization?
a) Activation energy at the interface is the controlling factor
b) The resistance of transition between electrodes and electrolytes
c) Diffusion of ions in the bulk solution is the controlling factor
d) The resistance of reacting ions for diffusion is the controlling factor
Q.8.
Which two scientists present the first formal presentation on mixed potential theory?
a) Wagner and Traud
b) Wagner and Evans
c) Traud and Nernst
d) Wilsmore and Nernst
Q.9.
Which of the following is/are the hypothesis of mixed potential theory?
a) Any electrochemical reaction can be divided into two or more partial reactions
b) No net accumulation of electric charge during the reaction
c) Any electrochemical reaction can be divided into two or more partial reactions and no net accumulation of electric charge during the reaction
d) Electrochemical reactions can’t be divided into partial reactions
Q.10.
Which of the following is depicted in the given mixed potential schematic?
a) Dissolution of zinc
b) Oxidation of hydrogen
c) Reduction of zinc
d) Dissolution of copper
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