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Solution


Q.

Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has an efficiency of 40% to produce electricity
C. uses aluminium as catalysts
D. is eco-friendly
E. is actually a type of Galvanic cell only

Choose the correct answer from the options given below:           [2024]
1 A, B, C only  
2 A, B, E only  
3 A, B, D only  
4 A, B, D, E only  

Ans.

(2)

A. The hydrogen-oxygen fuel cell was used for providing electrical power in the Apollo space programme.

B. Compared to thermal plants whose efficiency is about 40%, fuel cells produce electricity with an efficiency of about 70%.

C. Catalysts like finely divided platinum or palladium metal are incorporated into the electrodes of hydrogen-oxygen fuel cells for increasing the rate of electrode reactions.

D. Production of electricity by thermal plants is not a very efficient method and is a major source of pollution. In such plants, the chemical energy (heat of combustion) of fossil fuels (coal, gas, or oil) is first used for converting water into high-pressure steam. This is then used to run a turbine to produce electricity. Fuel cells on the other hand convert chemical energy directly to electrical energy (these are galvanic cells). Hence fuel cells are eco-friendly.

E. Fuel cells are galvanic cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc., directly into electrical energy.