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Why does ornaments made of gold and plat...

Why does ornaments made of gold and platinum retain their lustre even after several years?

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Metals such as gold and platinum being the least reactive, do not corrode at all.
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  1. Why does ornaments made of gold and platinum retain their lustre even ...

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  2. A certain alloy is made using copper, along with zinc. It is resistant...

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  3. Which of following is an element?

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  4. Which of the following are the main constituents or alloy 'solder'?

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  5. Which alloy is used to make balances and scientific instruments?

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  6. Which alloy is made up of chromium, nickel and iron?

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  7. Which of these is an alloy?

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  8. Which non-metal is used for making pencil lead?

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  9. Which process helps in hardening of rubber?

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  10. Which metal is used to make compasses, nails, and chains?

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  11. Which metal is used in thermometers?

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  12. Which of these causes rusting of iron?

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  13. Write the formula of rust.

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  14. What change is observed on copper surface due to the action of air and...

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  15. Identify the process in which metals are gradually eaten by exposure t...

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  16. Why is mercury placed below hydrogen in the metal reactivity serices?

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  17. Which metal can displace copper from copper sulphate solution?

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  18. Which of these is the least reactive metal?

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  19. The arrangement of metals on the basis of their reactivity is known as...

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  20. Which metal reacts with water or steam?

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  21. What is the product of the reactive between sulphur dioxide and water?

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