Which one of the following is water gas ?

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Mixture of carbon monoxide and hydrogen

Mixture of carbon monoxide and nitrogen

Mixture of carbon dioxide and water vapour

Mixture of carbon monoxide and water vapour

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This question was previously asked in

UPSC NDA-1 – 2016

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The correct option is A.

Water gas is a synthesis gas mixture primarily consisting of carbon monoxide (CO) and hydrogen (H₂). It is produced by passing steam over hot carbon (like coke or coal) at high temperatures (typically 700-1000 °C). The reaction is C + H₂O → CO + H₂.

Producer gas is another type of synthesis gas, produced by passing air over hot carbon, and primarily consists of carbon monoxide (CO) and nitrogen (N₂), along with some hydrogen and carbon dioxide. Water gas is a more energy-rich fuel than producer gas because it contains hydrogen and lacks the large proportion of inert nitrogen.

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