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The oxygen fuel cells are used for the space crafts mostly because of their __________

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The oxygen fuel cells are used for the space crafts mostly because of their __________

(a) Light weight

(b) Heavier weight

(c) Efficiency

(d) Noise levels

This question was posed to me in an interview.

My question comes from Biomass and Biofuel in chapter Non Conventional Energy Sources and Storage Devices of Applied Chemistry

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The correct option is (a) Light weight

To elaborate: The oxygen fuel cells are used for the space crafts mostly because of their light weight. The by product is water that is valuable fresh water source for astronauts.

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