Question

Choose the correct statements:
a) Damp air alone supplies both air and water needed for corrosion.
b) Ordinary water supplies both air and water for corrosion.
c) Moist air provides both air and water

• A. a, b
• B. a, c
• C. b, c
• D. All of the above

Answer 1

Answer: (C)

b, c

Damp or moist air supplies both air and water vapours needed for rusting of Iron. Ordinary water has some air dissolved in it. So, it can also corrode a metal, However, dry air has no water element thus, it won't corrode a metal. The correct option is $C$.