Question

Which of the following are true in the case of corrosion?

• A. Causes metals to shrink
• B. Damages things made up of metals
• C. Increases strength of metals
• D. Metal strength remains unaffected

Answer 1

The correct option is B Damages things made up of metals

Corrosion is a gradual degradation of the metal surface when it comes in contact with air and moisture. A layer of metal oxide or metal sulphide, etc. is formed on the surface which has properties different from the actual metal surface.
It damages the things made up of metals and reduces their strength. But it does not lead to expansion or shrinking of metals.