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What is rust ?...

What is rust ?

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The coating of brown, flaky substance on the surface of iron when it is kept exposed in moist air is called rust.
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VK GLOBAL PUBLICATION-METALS AND NON-METALS-VERY SHORT ANSWER QUESTIONS
  1. What is the nature of non - metal oxide?

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  2. What is the nature of metal oxides?

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  3. Why do copper objects develop a green coating in air?

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  4. Why do silver articles become black after some time ?

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  5. Which oxide of iron could be obtained on prolonged reaction of iron wi...

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  6. Why are ionic compounds usually hard?

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  7. Why does aluminium not react with water under ordinary conditions?

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  8. In nature, metal A is found in a free state while metal B is found in ...

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  9. Arrange the following metals in decreasing order of their reactivity. ...

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  10. Why cannot aluminium be obtained by reduction of its oxide with carbon...

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  11. Why does a little addition of carbon in iron make it more useful?

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  12. Give an example of a sulphide ore which is reduced to metal by heating...

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  13. Metals are refined by using different methods. Which of the following ...

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  14. What is rust ?

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  15. What is corrosion?

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  16. What is aqua regia? Write its reaction product with gold and platinum.

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  17. Which metals are mixed with iron to get stainless steel?

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  18. Why is stainless steel preferred for making household utensils?

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

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  20. Name an alloy of (i) aluminium used in the construction of aircraft....

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