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Why are the metals like Na,K,Ca and Mg n...

Why are the metals like Na,K,Ca and Mg never found in their free state in nature?

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Explain the following (a) Reactivity of At decreases if it is dipped in HNO_(3) . (b) Carbon cannot reduce the oxides of Na or Mg. (c) mm is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. (d) Iron articles are galvanised. (e) Metals like Na, K. Ca and Mg are never found in their free state in nature.

Explain the following: (a) Sodium chloride is an ionic compound which does not conduct electricity in solid state whereas it does conduct electricity in molten state as well as in aqueous solution. (b) Reactivity of aluminium decrease if it is dipped in nitric acid. (c) Metals like calcium and magnesium are never found in their free state in nature.

Two metals which are found in the free state in nature.

The metal always found in the free state is

The metal always found in the free state is

The metal found always in the free state , is

LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. Which property of 'solder' alloy makes It suitable for welding electri...

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  2. Explain why, arbon cannot reduce oxides of sodium or magnesium.

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  3. Why are the metals like Na,K,Ca and Mg never found in their free state...

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  4. Name one metal each which is extracted by: (a). Reduction with carbo...

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  5. Fill in the following blanks with suitable words: ltbr. (a). The corro...

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  6. How is manganese extracted from manganese dioxide, MnO(2)?Explain with...

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  7. What is a thermite reaction? Explain with the help of an equation.stat...

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  8. Which one of the methods given in column I is applied for the extracti...

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

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

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

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

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

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

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

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

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

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

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

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

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