Question

Rusting of iron is quicker in saline water than in orderinary water. Give reason.

Answer 1

In saline water, the presence of `Na^(+) and Cl^(-)` ions increases the conductance of the solution in contact with the metal surface. This accelerates the formation of `Fe^(2+)` ion and hence that of rust, `Fe_(2)O_(3).xH_(2)O`