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Q.

Hydrogen-oxygen fuel cells are used in spacecrafts to supply 

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a

water

b

oxygen

c

hydrogen

d

illumination

answer is C.

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Detailed Solution

Hydrogen-oxygen fuel cells are used in spacecrafts to supply is water.

Oxygen and hydrogen fuel must be delivered to hydrogen-oxygen fuel cells. Once a spaceship departs from the Earth, this can become an issue. Solar cells, however, are found on orbiting spacecraft. These transform light into electricity, allowing water to be electrolyzed in place of the hydrogen and oxygen.

Hence, correct option is C.

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