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(a) Why is an iron grill painted frequen...

(a) Why is an iron grill painted frequently?
(b). Explain why, through aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.

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(a) To prevent its rusting
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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. (a) Give reasonwhy copper is used to make hot water tanksbut steel (an...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. (a) Name the chemical compound which is electrolysed in molten state t...

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  20. (a). Name two metals which are found in nature mainly in the free stat...

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