Question

Identify the correct statement :
(JEE Main 2016)

• A. Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
• B. Iron corrodes slowly in salt water because its electrochemical potential is higher.
• C. Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
  
• D. Iron corrodes in oxygen-free water.

Answer 1

The correct option is C Corrosion of iron can be minimized by forming an impermeable barrier at its surface.


To prevent corrosion of Iron it is placed in contact with another metal of higher oxidation potential.
Iron needs oxygen as well as moisture to corrode, hence it cannot be corroded in oxygen-free water.
Corrosion of iron can be minimized by forming an impermeable barrier at its surface, as it prevents the exposure of iron surface to atmosphere.
Hence option (D) is correct.