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(a) Hydrogen peroxide
(b) Hydronium
(c) Oxygen
(d) Water vapour

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Answer:

(d) Water vapour

Explanation:

Fuel Cell Electric Vehicles (FCEVs) powered by hydrogen produce water vapour as their primary emission. The hydrogen reacts with oxygen in the fuel cell to generate electricity, and the only by-product of this reaction is water (H2O), which is released as water vapour.

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