Q.1
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)
Q.2
An electrochemical reaction is always a combination of oxidation half-cell and a reduction of half-cell.
  • a) True
  • b) False
Q.3
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
Q.4
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
Q.5
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
Q.6
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
Q.7
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
Q.8
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
Q.9
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
Q.10
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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