Which of the following methods is suitable to prevent an iron frying pan from rusting?
- AApplying a zinc coating
- BApplying paint
- CApplying grease
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (a) Applying a zinc coating
Explanation
Galvanisation, coating iron with zinc, protects it even where the coating is scratched, because zinc corrodes first (sacrificial protection).
Paint would burn off a frying pan on the stove, and grease alone washes off, so the coating of zinc is the method given as suitable (NCERT Exemplar, Class 10 Science).