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

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Answer:

Cr₂O₇^2– → 2Cr³⁺2Cr⁶⁺ + 6e– → 2Cr^³⁺

In given equation there are 6 electrons are required so that n = 6

Use the formula

Required charge = nF

Plug the values in this formula we get

Required charge = 6 × 96487 Coulombs

= 578922 Coulombs

= 5.79 × 10⁵ Coulombs

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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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