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(a) Why does aluminium not corrode right...

(a) Why does aluminium not corrode right through ?
(b) What is meant by 'anodising' ? Why is it done ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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