Which of the following statements regarding fuel cell is incorrect?

  1. A

    These cells are eco-friendly.

  2. B

    These cells convert energy of combustion of fuels like H2, CH4, CH3OH etc., directly into electrical energy.

  3. C

    H2 – O2 fuel cell is used in Apollo space programme.

  4. D

    Fuel cells produce electricity with an efficiency of about 100%.

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    Solution:

    Fuel cells produce electricity with an efficiency of about 70% compared to thermal plants whose efficiency is about 40%.

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