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Explain why, iron pipes for carrying wat...

Explain why, iron pipes for carrying water are coated with zinc.

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Iron gets corroded when it comes in contact with air and moisture. So, they are coated with zinc so that it forms a layer on the iron and prevents it from rusting.
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LAKHMIR SINGH & MANJIT KAUR-PHYSICAL AND CHEMICAL CHANGES-EXERCISE
  1. Fill in the following blanks with suitable words : Some susbtances c...

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  2. Why is an Iron grill painted frequently ?

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  3. Explain why, iron pipes for carrying water are coated with zinc.

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  4. Why are the tools and machine parts made of iron smeared with grease o...

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  5. Explain how, painting of an Iron gate prevents it from rusting.

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  6. Explain why, rusting of Iron objects is faster in coastal areas than i...

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  7. What is meant by galvanisation? Why is it done?

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  8. State two ways to prevent the rusting of iron.

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  9. What is stainless steel ? How is stainless steel made ? State an impor...

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  10. State three differences between a physical change and a chemical chang...

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  11. Write a word equation to represent the process of rusting of iron. Als...

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  12. Explain why, explosion of a firework (such as cracker) is said to be a...

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  13. Explain why, melting of ice to form water is said to be a physical cha...

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  14. What is meant by crystallisation ? State its one use.

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  15. Describe how, crystals of copper sulphate are prepared.

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  16. Give example of a chemical change which occurs by the action of heat.

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  17. Give example of a physical change which occurs by the action of heat.

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  18. What is a (a) physical change, and (b) chemical change ? Give two exam...

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  19. What is meant by the rusting of iron ? State two conditions necessary ...

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  20. What happens when an iron nail is kept immersed in copper sulphate sol...

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