Corrosion and its prevention

8 questions on Corrosion and its prevention from the Electrochemistry chapter: 2 NEET level, 3 JEE Main, 3 JEE Advanced. Each one opens with its answer and solution.

• Rust formed on iron exposed to moist air is chiefly NEET level
• Which metal can be used as a sacrificial anode to protect an underground iron pipeline from corrosion? NEET level
• According to the electrochemical theory of rusting, at anodic spots Fe -> Fe^2+ + 2e- and at cathodic spots O2 + 4H+ + 4e- -> 2H2O. Which statement is correct? JEE Main level
• Which of the following would increase the rate of rusting of an iron article? JEE Main level
• Which of the following is NOT a method of preventing the corrosion of iron? JEE Main level
• In the rusting of iron in acidic moist air, the anodic reaction is Fe -> Fe^2+ + 2e- with E deg(Fe^2+/Fe) = -0.44 V and the cathodic reaction is O2 + 4H+ + 4e- ... JEE Advanced level
• Consider the cathodic protection of a buried iron pipeline. Given E deg(Fe^2+/Fe) = -0.44 V, E deg(Zn^2+/Zn) = -0.76 V, E deg(Cu^2+/Cu) = +0.34 V. Which stateme... JEE Advanced level
• A buried steel tank is protected by a magnesium sacrificial anode, Mg -> Mg^2+ + 2e-. The protective current flowing from the anode to the tank is 0.0500 A on a... JEE Advanced level