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(a) Give reasonwhy copper is used to mak...

(a) Give reasonwhy copper is used to make hot water tanksbut steel (an alloy of iron) is not.
(b). Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

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(a) Copper does not corrode easily in the presence of water but steel rusts in the presence of water.
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Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Why do some metals acquire a dull appearance on exposure to air for a long time ?

Why is copper used to make hot water tanks but steel (an alloy of iron) is not used?

Explain why the surfaces of some metals become dull when exposed to air for sometime.

LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
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  2. Which one of the methods given in column I is applied for the extracti...

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  3. (a) Give reasonwhy copper is used to make hot water tanksbut steel (an...

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  4. (a) Why does aluminium not corrode right through ? (b) What is meant...

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  5. (a) Why is an iron grill painted frequently? (b). Explain why, throu...

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  6. (a) Name the method by which aluminium metal is extracted. (b) Give ...

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  7. (a). Name two metals which occur in nature in free state as well as in...

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  8. How doet the method used for extracting a metal from its ore depend on...

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  9. Explain by giving one example, how highly reactive metals (which are h...

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  10. Describe with one example, how moderately reactive metals (which are i...

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  11. (a) Define the terms (i) mineral (ii) ore and (iii) gangue. (b) What...

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  12. Explain how, a reduction reaction fo aluminium can be used for welding...

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  13. (a) What is corrosion? (b) Name any two metals which do not corrode ...

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  14. What is meant by 'rusting' ? With labelled diagrams, describe an activ...

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  15. (a). What is an alloy? How is an alloy made? (b) What elements are p...

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  16. (a) Name two metals which resist corrosion due to the formation of a t...

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  17. (a) name an alloy of copper. State its chemical composition and ay one...

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  18. (a) How does the painting of an iron object prevent its rusting? (b)...

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  19. What happens when (a) ZnCO(3) is heated in the absence of oxygen ? ...

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  20. (a) For the reduction of a metal oxide, suggest a reducing agent other...

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