In galvanisation, the zinc coating mainly prevents iron from coming into contact with which of the following?
Answer and explanation
Correct answer: Air and moisture
The zinc coating acts as a barrier between iron and air and moisture. Rusting generally requires both oxygen and water/moisture, so preventing their contact reduces rusting of iron. Oxygen alone or moisture alone is an incomplete answer. In addition, zinc is more reactive than iron and can provide some protection even if the coating is scratched.
Frequently asked questions
What is the correct answer to this question?
Air and moisture
Why is this the correct answer?
The zinc coating acts as a barrier between iron and air and moisture. Rusting generally requires both oxygen and water/moisture, so preventing their contact reduces rusting of iron. Oxygen alone or moisture alone is an incomplete answer. In addition, zinc is more reactive than iron and can provide some protection even if the coating is scratched.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
