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Corrosion Engineering Objective
Which of the following is a cathode and anode respectively in the Ag-Fe system?
a) Iron (Fe) and Silver (Ag)
b) Silver (Ag) and Iron (Fe)
c) Gold (Ag) and Iron (Fe)
d) Iron (Fe) and Gold (Ag)
An electrochemical reaction is always a combination of oxidation half-cell and a reduction of half-cell.
What is the cathodic and anodic reactions respectively of Cu-Ag system?
a) Ag==>Ag+2+2e and Cu+2+2e==>Cu
b) Cu==>Cu+2+2e and Ag==>Ag+2+2e
c) 2Ag+1+2e==>2Ag and Cu==>Cu+2+2e
d) 2Ag==>2Ag+1+2e and Cu+2+2e==>Cu
Which of the following type of reaction is shown in the given figure?
a) Non-spontaneous reaction
b) Equilibrium reaction
c) Neither spontaneous nor non-spontaneous reaction
d) Spontaneous reaction
Which of the following diagrams shows the stability of metals over a range of pH and potential of a system?
a) Phase diagrams
b) Pourbaix diagrams
c) Phase diagrams and Pourbaix diagrams
d) Colling curves
What is depicted in the given figure?
a) Phase diagram of the Fe-C system
b) Pourbaix diagram for Fe-O2 system
c) Pourbaix diagram for Fe-H2O system
d) Colling curve pure iron
Which of the following zone of given Pourbaix diagram indicates the immune zone?
a) Zone 1
b) Zone 2
c) Zone 3
d) Zone 4
Which of the following zone(s) of given Pourbaix diagrams indicate a passive zone?
a) Zone 1 and 2
b) Zone 2 and 3
c) Zone 2, 3 and 6
d) Zone 4 and 5
Which of the following is/are the applications of Pourbaix diagrams?
a) Predicting the spontaneous direction of reactions
b) To reduce corrosion attack
c) To reduce corrosion attack, to predict the direction of spontaneous reaction and to estimate the composition of corrosion product
d) To estimate the composition of corrosion product
Which of the following is/are the limitations of Pourbaix diagrams?
a) Rate of reaction is can’t be predicted
b) It neglects the impurities of working conditions
c) Stability of metallic species is predicted
d) Rate of reaction is not predicted and it neglects the impurities of working conditions
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