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Question : 20
Total: 35
(a) Give reasons:
(i) Mercury cell delivers a constant potential during its life time.
(ii) In the experimental determination of electrolytic conductance, Direct Current (DC) is not used.
OR
(b) Define fuel cell with an example. What advantages do the fuel cells have over primary and secondary batteries?
(i) Mercury cell delivers a constant potential during its life time.
(ii) In the experimental determination of electrolytic conductance, Direct Current (DC) is not used.
OR
(b) Define fuel cell with an example. What advantages do the fuel cells have over primary and secondary batteries?
Solution: 👈: Video Solution
(a) (i) as the overall reaction does not involve any ion in the solution whose concentration changes during its life period.
(ii) If we apply DC current through the conductivity cell, it will lead to the electrolysis of the solution taken in the cell, So, AC current is used for this measurement to prevent its electrolysis.
OR
(b) Fuel cell : A fuel cell is an electrochemical cell that generates electricity/electrical energy from fuel via an electrochemical reaction. It offers high efficiency and zero emissions. eg. The polymer electrolyte fuel cells etc.
Advantages:
Good reliability - quality of power does not degrade over time
Environmentally beneficial - greatly reducesC O 2
(ii) If we apply DC current through the conductivity cell, it will lead to the electrolysis of the solution taken in the cell, So, AC current is used for this measurement to prevent its electrolysis.
OR
(b) Fuel cell : A fuel cell is an electrochemical cell that generates electricity/electrical energy from fuel via an electrochemical reaction. It offers high efficiency and zero emissions. eg. The polymer electrolyte fuel cells etc.
Advantages:
Good reliability - quality of power does not degrade over time
Environmentally beneficial - greatly reduces
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