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Answer:

The Metals which is at the top of the reactivity series can extracted electrolytically.

So all alkali metals and some alkaline metals can extracted with this method.

Example Li, Na, K, Mg, Al etc.

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12. Consider the reaction: Cr₂O₇^2– + 14H⁺ + 6e- → 2Cr³⁺ + 8H₂O
What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr₂O₇^2-?

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13.

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

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14. Suggest two materials other than hydrogen that can be used as fuels in fuel cells.

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15. Explain how rusting of iron is envisaged as setting up of an electrochemical cell.

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16. What is thermodynamic efficiency of a cell?

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17. Name the electrolyte used in fuel cell?

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18. Can we use copper vessel to store AgNO₃solution ?

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19. Suggest a metal that can be used for cathodic protection of iron against rusting.

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20. How does a fuel cell operate?

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