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The production of water gas involves passing steam over a bed of heated coal. Which of the following represents the correct chemical reaction for this process?

1. H2O reacts with carbon at high temperatures to form hydrogen and carbon monoxide.
2. Glass behaves as a liquid that has been cooled below its freezing point without solidifying.
3. Supercooling refers to reducing the temperature of a substance below its freezing point while it remains in liquid form.
4. Silicon tetrachloride reacts with moisture in the air to produce white fumes, which are utilized as a smoke screen during warfare.

Correct answer: H2O reacts with carbon at high temperatures to form hydrogen and carbon monoxide.

Solution

Water gas is produced by the reaction of steam with red-hot coal, forming a mixture of H2 and CO. This is a direct recall of the reaction.

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