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Gold jewellery does not become dull. Why...

Gold jewellery does not become dull. Why ?

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VGS PUBLICATION-BRILLIANT-METALS AND NON-METALS-EXERCISE
  1. The doctor reported iron deficiency in my body. Where is iron in my bo...

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  2. I heard that magnesium is found in plants. In what form is it found in...

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  3. Gold jewellery does not become dull. Why ?

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  4. Predict the reason behind gold and platinum jewellery does not become ...

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  5. Which ga makes a pop sound if exposed to lighted matchstick?

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  6. Which substance liberates hydrogen when reacts with metals?

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  7. In a chemical reaction iron is unable to displace zinc from zinc sulph...

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  8. Why do silver jewellery, tarnish black after sometime ?

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  9. It is recommended that our old jewellery should not be polished by gol...

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  10. Which metals are used in making jewellery?Why?

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  11. Taking the example of magnesium and sulphur explain how metals and non...

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  12. Why do some metals replace the other metals from solution ?

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  13. What happens when : Dilute sulphuric acid is poured on a copper plate ...

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  14. What will happen when iron nails dipped in copper sulphate solution?

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  15. Why are bells made up of metals instead of wood?

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  16. Give two uses of aluminium .

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  17. Write any two differences between electric conductors and insulators.

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  18. Write any four uses of metals in different situations.

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  19. Prepare a table of various metals and non-metals used in our daily lif...

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  20. Why are aluminium foils used to wrap food items ?

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