In galvanisation, the zinc layer protects iron from contact with which substances?
Answer and explanation
Correct answer: Air and moisture
Galvanisation is the coating of iron or steel with zinc to prevent corrosion. Rusting requires iron to come into contact with oxygen in air and water or moisture. The zinc coating acts as a barrier, so air and moisture cannot readily reach the iron surface; zinc also offers sacrificial protection if scratched. Therefore option A is correct. Sound, light, salt, sugar, hydrogen and nitrogen are not the required pair for ordinary rusting.
Frequently asked questions
What is the correct answer to this question?
Air and moisture
Why is this the correct answer?
Galvanisation is the coating of iron or steel with zinc to prevent corrosion. Rusting requires iron to come into contact with oxygen in air and water or moisture. The zinc coating acts as a barrier, so air and moisture cannot readily reach the iron surface; zinc also offers sacrificial protection if scratched. Therefore option A is correct. Sound, light, salt, sugar, hydrogen and nitrogen are not the required pair for ordinary rusting.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Metals and Non-metals.
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