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Electrochemistry

Short Answer Type

11. Suggest a list of metals that are extracted electrolytically.

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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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Long Answer Type

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

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Short Answer Type

16. What is thermodynamic efficiency of a cell?

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17. Name the electrolyte used in fuel cell?

Answer:

Aqueous NaOH or aqueous KOH.

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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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