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Why do metals generally appear to be dul...

Why do metals generally appear to be dull ?

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When metals are kept exposed to air for sometime, oxygen present in air slowly combines with the metal to form metal oxide. It is deposited as a layer on the surface of metals. They appear to be dull.
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DINESH PUBLICATION-METALS AND NON-METALS-Very Short Answer Questions
  1. Which metal is used in amalgams ?

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  2. Why are metals good conductors of electricity while non-metals are not...

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  3. Why do metals generally appear to be dull ?

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  4. Name two non-metals which exist in the solid state the two non-metals ...

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  5. Name metal whose foils are used for the packing of food materials.

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  6. The electronic configuration of an elements 'E' (Z = 16) is 2, 8, 6. W...

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  7. Alloys are used in electrically heating devices rather that pure metal...

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  8. A shining metal 'X' on heating gives copper (II) oxide or cupric oxide...

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

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  10. Name a metal other than aluminium that is covered with a layer of oxid...

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  11. What is the common feature in the electronic configuration of metal at...

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  12. Name one metal and one non-metal which exist in liquid state at room t...

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  13. What changes do you observe in the iron nails and colour of copper sul...

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  14. What are amphoteric oxides? Give two examples of amphoteric oxides.

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  15. Name a non-metal which is lustrous and a metal which is non-lustrous.

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  16. Give the electronic configuration of an element having atomic number 1...

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  17. A non-metal X exists in two different forms Y and Z. Y is hardest natu...

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  18. Aluminium occurs in the combined state while gold does not. Why ?

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  19. If copper metal is heated over a flame, it develops a coating. What is...

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  20. Why does not stainless steel get rusted easily ?

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